2003 Subaru WRX Performance Air Intake Systems

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    • Injen® IS Series Short Ram Intake System
      (1 reviews)
      # 359305
      Subaru WRX 2003, IS Series Short Ram Intake System by Injen®. The IS Series is a traditional, underhood air intake system that takes the place of your factory airbox and air filter, and the factory air intake tube. The EA Nanofiber...
      Improves airflow into the engineIncreases horsepower
      $173.45 - $182.12
    • Injen® RD Series Cold Air Intake System
      (0 reviews)
      # 360144
      Subaru WRX 2.0L 2003, RD Series Cold Air Intake System by Injen®. The RD Series is made for the enthusiast who wants improved mid-range power. This cold air system positions a high-flow air filter behind the bumper, where it can...
      Delivers more oxygen to the combustion chamber by drawing in cooler airCustom designed and engineered to deliver maximum power for each specific vehicle
      $278.38
    • K&N® 69 Series Typhoon Cold Air Intake Kit
      (0 reviews)
      # 73903627
      Subaru WRX 2003, 69 Series Typhoon Cold Air Intake Kit by K&N®. Improve airflow and increase horsepower on your vehicle. This intake kit replaces the factory air intake system with a custom designed air intake tube and a free...
      Guaranteed to increase horsepower and improve accelerationCustom designed and engineered for each application
      $289.99 - $291.99
    • K&N® 57i Series Generation I Induction Kit
      (0 reviews)
      # 73903621
      Subaru WRX 2003, 57i Series Generation I Induction Kit by K&N®. This induction kit is an easy and inexpensive way to increase airflow into your engine. It replaces your restrictive factory airbox with a free flowing K&N air filter....
      Guaranteed to increase horsepowerSpecifically designed for each application
      $166.99 - $198.99
    • K&N® Apollo Cold Air Induction System
      (0 reviews)
      # 73906105
      Subaru WRX 2003, Apollo Cold Air Induction System by K&N®. Cooler air inlet temperatures mean more horsepower. This kit turns any air intake system into a Cold Air intake system. It replaces the OEM airbox with a K&N air filter in...
      Guaranteed to increase horsepower and improve accelerationWorks with OEM computer system
      $243.99
    • AEM® Cold Air Intake System
      (0 reviews)
      # 55968635
      Subaru WRX 2003, Cold Air Intake System by AEM®. To deliver cooler air to the engine, this air intake system places the air filter outside the engine compartment. Cooler air is denser than warm air and so contains more oxygen,...
      Delivers more oxygen to the combustion chamber by drawing in cooler airCustom designed and engineered to deliver maximum power for each specific vehicle
      $268.99 - $292.99
    • AEM® Short Ram Air Intake System
      (0 reviews)
      # 55968640
      Subaru WRX 2003, Short Ram Air Intake System by AEM®. This system is an economical alternative to AEM's Cold Air Intake system. The Short Ram system installs easily under the hood, and on some applications outperforms the longer...
      Delivers increased performance for less costEasily installs under the hood
      $175.99 - $186.99
    • aFe® Stage 2 Cold Air Intake System
      (0 reviews)
      # 926150
      Subaru WRX Sti 2.0L / 2.5L 2003, Stage 2 Cold Air Intake System by aFe®. The aFe Stage 2 Cold Air Intake System replaces your entire factory air intake system with a large high-flow aFe air filter, open element airbox/heat shield...
      $325.00
    • Takeda® Retain Short Ram Air Intake System with Pro DRY S Air Filter
      (0 reviews)
      # 81748228
      Subaru WRX 2003, Retain Short Ram Air Intake System with Pro DRY S Air Filter by Takeda®. Polished. Improve your car's performance and enhance the appearance of your engine bay with the Takeda Retain Short Ram Air Intake System....
      Custom designed for each applicationIncreases airflow, for gains in horsepower and torque
      $325.00
    • DC Sports® Polished Aluminum Cold Air Intake System
      (0 reviews)
      # 11019481
      Subaru WRX 2003, Polished Aluminum Cold Air Intake System by DC Sports®. DC Sports Air Intake Systems provide the best of both worlds in heat protection and improved breathability. Every kit includes a air filter that requires no...
      Gives your vehicle a serious performance boostPrecision engineered for your vehicle
      $182.76
    • DC Sports® Polished Aluminum Short Ram Intake System
      (0 reviews)
      # 11019527
      Subaru WRX 2003, Polished Aluminum Short Ram Intake System by DC Sports®. DC Sports Air Intake Systems provide the best of both worlds in heat protection and improved breathability. Every kit includes a air filter that requires no...
      $122.52
    • Agency Power® Short Ram Air Intake Kit
      (0 reviews)
      # 15847823
      Subaru WRX 2003, Short Ram Air Intake Kit by Agency Power®. The Agency Power is made for the enthusiast who wants maximum horsepower from a tuned cold air intake system. This cold air system positions a high-flow air filter behind...
      Delivers more oxygen to the combustion chamber by drawing in cooler airCustom designed and engineered to deliver maximum power for each specific vehicle
      $175.00
    • HKS® Racing Suction Reloaded Kit
      (0 reviews)
      # 70887875
      Subaru WRX 2003, Racing Suction Reloaded Kit by HKS®. Color: Yellow. Element Size: 200 mm. Inlet Size: 80 mm. Included in each kit is HKS Reloaded filter with its patented Super-Funnel and new technical advances: Filter cage allows...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $280.84
    • HKS® Super Power Flow Reloaded Kit
      (0 reviews)
      # 70194021
      Subaru WRX 2003, Super Power Flow Reloaded Kit by HKS®. Back Plate Color: Black. Element Size: 200 mm. Inlet Size: 80 mm. Ambient exposure type air cleaner has larger area of induction inlet that increases intake air volume. Engine...
      Frame SupportIt fits to aluminum back plate softly and fixes Super Stealth Frame firmly. It will also be a guide for filter to surface of the hemisphere that make easy for replacement work of the filter.
      $177.59
    • PERRIN Performance® Cold Air Intake
      (0 reviews)
      # 73693621
      Subaru WRX 2003, Cold Air Intake by PERRIN Performance®. Add horsepower and style under your hood with the PERRIN cold air intake. The PERRIN intake has been designed with precise MAF alignment and tubing size to maintain proper...
      Perfect cold air bathAdd 5 wheel HP to your car
      $333.00 - $360.00
    • PERRIN Performance® Short Ram Air Intake
      (0 reviews)
      # 73693602
      Subaru WRX 2003, Big MAF Short Ram Black Air Intake by PERRIN Performance®. Increase horsepower and style under your hood. The PERRIN Performance intake system uses proper MAF alignment and plumbing size, which are crucial to...
      Precision CNC construction for perfect fitThroaty deep tone sound
      $199.80 - $226.80
    • Spectre Performance® Panel HPR™ OE Replacement Air Filter
      (1 reviews)
      # 49224886
      Subaru WRX 2003, Panel HPR™ OE Replacement Air Filter by Spectre Performance®. Rooted in racing, Spectre Performance designs and builds every product with the same goal in mind - the best performance in the market proven on the...
      High-tech engine parts for the most power and best performanceThe finest exterior and interior parts for superior appearance and functionality
      $17.03
    • K&N® 33 Series Panel Air Filter
      (1 reviews)
      # 321318
      Subaru WRX 2003, 33 Series Panel Air Filter by K&N®. A K&N 33 series OE replacement air filter is designed to increase horsepower and acceleration. These washable and reusable panel air filters are easy to install because they fit...
      Improves engine airflowIncreases horsepower and acceleration
      $49.99
    • AIRAID® Air Filter
      (1 reviews)
      # 436755
      Subaru WRX 2003, Red Air Filter by AIRAID®. Advanced air filtration technology, superior construction and the world's best warranty make an AIRAID air filter the best you can buy. It allows increased airflow and provides better air...
      Improves airflow and engine performanceProvides superior air filtration and engine protection
      $58.04 - $62.11
    • GREEN FILTER® Factory Replacement Air Filter
      (0 reviews)
      # 56295888
      Subaru WRX except Turbocharged 2003, Factory Replacement Air Filter by GREEN FILTER®. Replace your factory air cleaner filter element with a Green Filter oiled-cotton filter and never buy another filter as long as you own your...
      Cleanable, reusable filter element will outlast your carTraps particles as small as 5 microns
      $48.35
    • HKS® Super Hybrid Filter
      (0 reviews)
      # 70194020
      Subaru WRX 2003, Super Hybrid Filter by HKS®. 3 layered filter divides, collects intake air and smoothes air flow. It enables quick response that is required for sport filter. Newly developed Non-woven fabric is the first layer...
      With high strength double frame, strong frame can be used for high horsepower.Shape of re-designed top frame enables smooth air flow.
      $35.00
    • PERRIN Performance® 3.125" Foam Type Cone Filter
      (0 reviews)
      # 84938455
      Subaru WRX 2003, 3.125" Foam Type Cone Filter by PERRIN Performance®. This is a direct replacement for most PERRIN Performance intake systems including the Big MAF intakes. PERRIN Performance filters feature a unique two piece...
      Two-piece design for easy cleaningOpen cell foam element
      $62.10
    • PERRIN Performance® Panel Air Filter
      (0 reviews)
      # 74187513
      Subaru WRX 2003, Panel Air Filter by PERRIN Performance®. Don’t let a restrictive OEM paper filter get between you and true performance. The PERRIN Performance™ drop-in Panel Filter is the answer for more horsepower. A stealthy...
      Open cell foam elementCleaner for efficient and trouble-free cleanup
      $43.20
    • BTP® Panel Air Filter
      (0 reviews)
      # 66967020
      Subaru WRX H4 Engine 2.0L Car 2003, Panel Air Filter by BTP®. This BTP superior part helps your air intake system to provide improved airflow to ensure your engine operates at its maximum. This performance part is made from premium...
      Designed for the ultimate in performanceMade from premium materials
      $30.60
    • Spectra Premium® Mass Air Flow Sensor
      (0 reviews)
      # 57164929
      Subaru WRX 2003, Mass Air Flow Sensor by Spectra Premium®. Includes Sensor only. This is an aftermarket part that replaces factory OE # 22680AA310. Spectra Premium’s complete line of new Mass Air Flow Sensors, featuring Ceramic...
      Provide more consistent voltage to eliminate engine rough idle problemsPlatinum connector threads reduce the number of connection points for faster reaction to change
      $79.18
    • PERRIN Performance® Afta-Maf Intake Tube
      (0 reviews)
      # 73693598
      Subaru WRX 2003, Afta-Maf Intake Tube by PERRIN Performance®. Construction: 5-ply Silicone. The PERRIN Performance Afta MAF Hose replaces the factory corrugated rubber hose between the inlet tube and air box. This is an awesome...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $79.20
    • PERRIN Performance® Blow-Thru Boost Tube
      (0 reviews)
      # 73693615
      Subaru WRX 2003, Blow-Thru Boost Tube by PERRIN Performance®. The Blow-Thru Boost Tube is intended for use on Subarus which are using aftermarket turbo chargers that can "outflow" the stock intake system. It replaces a PERRIN front...
      Built-in BigMAF intake systemReduces the risks of air leaks
      $261.00
    • PERRIN Performance® Cold Air Extension
      (0 reviews)
      # 73693618
      Subaru WRX 2003, Cold Air Extension by PERRIN Performance®. Turn your PERRIN short ram intake system into a cold air intake system with the PERRIN cold air extension hose.
      Comes with the necessary hardware for secure mountingAvailable in several finishes
      $144.00
    • PERRIN Performance® Turbo Inlet Hose
      (0 reviews)
      # 73693688
      Subaru WRX 2003, Turbo Inlet Hose by PERRIN Performance®. Silicone technology allows us to design a turbo inlet hose that is better in all aspects than the OEM part and increases your engines horsepower and performance. The PERRIN...
      Designed to provide increased air flowSS internal support wire for added rigidity and collapse prevention
      $238.50 - $250.20
    • Spectre Performance® 3" Airflow Sensor Mount
      (1 reviews)
      # 12036601
      Subaru WRX 2003, 3" Airflow Sensor Mount by Spectre Performance®. Rooted in racing, Spectre Performance designs and builds every product with the same goal in mind - the best performance in the market proven on the racetrack! All...
      High-tech engine parts for the most power and best performanceThe finest exterior and interior parts for superior appearance and functionality
      $8.52
    • AVO® Electronics Throttle Controller
      (0 reviews)
      # 61628334
      Subaru WRX 2003, Electronics Throttle Controller by AVO®.
      $183.16
    • Torque Solution® Thermal Intake Manifold Gaskets
      (0 reviews)
      # 61628478
      Subaru WRX 2003, Thermal Intake Manifold Gaskets by Torque Solution®. Thermal Intake Manifold Gaskets use a proprietary gasket material that lowers intake temps by reducing heat transfer from the head to the intake manifold. These...
      $43.38
    • Torque Solution® Post MAF Intake Hose
      (0 reviews)
      # 61628479
      Subaru WRX 2003, Post MAF Intake Hose by Torque Solution®. Torque Solution continues to push the limits of high performance aftermarket products with our 4ply Silicone Post Maf Intake Hose. The factory intake hose is corrugated and...
      $70.51
    • Torque Solution® Thermal Throttle Body Gasket
      (0 reviews)
      # 61628487
      Subaru WRX 2003, Thermal Throttle Body Gasket by Torque Solution®. Thermal Throttle Body Gasket use a proprietary gasket material that lowers intake temps by reducing heat transfer. These gaskets can be used to replace factory...
      $26.87
    • FRAM® Extra Guard™ Flexible Panel Air Filter
      (0 reviews)
      # 18682475
      Subaru WRX 2003, Extra Guard™ Flexible Panel Air Filter by FRAM®. Size: 11.11" (L) x 6.56" (W) x 1.28" (H). Most dirt and dust enters the engine through the air filter and FRAM Extra Guard is engineered to provide twice the air...
      Provides better air filtration for improved performancePrevents damaging particles from entering your engine
      $9.24
    • Hastings® Air Filter
      (0 reviews)
      # 21456935
      Subaru WRX 2003, Air Filter by Hastings®. Clean air is critical to the performance of your engine, so don’t trust just any filter. Hastings filters are tested according to SAE J726 test procedures, where they meet or exceed the...
      Filters out dirt and dust in the air preventing them from entering the engineHeavy duty construction for long service life
      $12.49
    • Motorcraft® Air Filter
      (0 reviews)
      # 23869712
      Subaru WRX 2003, Air Filter by Motorcraft®. The air filter is a simple yet crucial part of your vehicle that keeps dust and road debris out of the engine. If the air filter is clogged up and starts to choke off the airflow to your...
      Direct OEM replacement for proper fitRecommended by Ford Motor Company
      $16.54
    • Full® Air Filter
      (0 reviews)
      # 8012740
      Subaru WRX 2003, Air Filter by Full®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste your...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $10.14
    • Purolator® Air Filter
      (0 reviews)
      # 7791673
      Subaru WRX 2003, Air Filter by Purolator®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $12.04
    • ACDelco® Professional™ Air Filter
      (0 reviews)
      # 73515730
      Subaru WRX 2003, Professional™ Air Filter by ACDelco®. Designed utilizing the latest technology, this Professional Air Filter by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $10.72
    • Beck Arnley® Air Filter
      (0 reviews)
      # 35812667
      Subaru WRX 2003, Air Filter by Beck Arnley®, Primary. For one hundred years, Beck/Arnley has been providing premium OE quality parts for vehicles. Beginning with motorcycle parts in 1914 and transitioning to import vehicles in the...
      OE quality products from top original equipmentTop quality materials
      $9.65
    • WIX® Air Filter Panel
      (0 reviews)
      # 64379465
      Subaru WRX 2003, Air Filter Panel by WIX®. Considering as much as 10,000 gallons of air must pass through the air filter for every gallon of fuel the engine consumes, WIX air filters play a vital part in preventing foreign...
      Prevents foreign particles like carbon, soot and abrasives from entering the fuel mixEnsures superior engine protection
      $14.76
    • A1 Cardone® Remanufactured Mass Air Flow Sensor
      (0 reviews)
      # 35535184
      Subaru WRX 2003, Remanufactured Mass Air Flow Sensor by A1 Cardone®. Mounting Hole Count: 2. Configuration Type: Bolt-On. Without Housing. With Mass Air Flow Sensor, Instruction Sheet. This is an aftermarket part that replaces...
      50-state emissions street legalThe finest quality at a great price
      $65.58
    • Delphi® Mass Air Flow Sensor
      (0 reviews)
      # 24559450
      Subaru WRX 2003, Mass Air Flow Sensor by Delphi®. When it comes to MAF sensors, communication with the ECM is key. That’s why Delphi MAF sensors use all new parts - never remanufactured parts that could harbor debris and...
      Extensive coverageAvailable in a variety of bore diameters to accommodate a wide range of airflow, resulting in a robust design for electrical overloads
      $111.54
    • Denso® Mass Air Flow Sensor
      (0 reviews)
      # 21071402
      Subaru WRX 2003, Mass Air Flow Sensor by Denso®. The air filter is the last line of defense against the harmful airborne abrasives that have been proven to wear out engines before their time. With OE-quality engineering and...
      Glass film coated sensing elements reduces contamination and improves reliabilityPlatinum wire sensing element responds quickly to changes in air flow
      $121.92
    • Genuine® Air Mass Meter Boot
      (0 reviews)
      # 81113965
      Subaru WRX 2003, Air Mass Meter Boot by Genuine®. With Housing. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement,...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $68.03
    • Mahle® Intake Manifold Gasket
      (0 reviews)
      # 8542558
      Subaru WRX 2003, Intake Manifold Gasket by Mahle®. Upper Intake to Lower Intake. Note: Between Upper and Lower Intake Manifold. Is your vehicle feeling down on power? Do you see dark puddles on the ground when you park? Is your...
      $14.65
    • APEXi® Power Intake Panel Filter
      (0 reviews)
      # 79118301
      Subaru WRX EJ20 Engine / EJ25 Engine 2003, Power Intake Panel Filter by APEXi®. Some manufacturers of performance air filters make aggressive claims about their filter's ability to make power, but leave out the fact that their...
      $36.89
    • Mishimoto® Silicone Intakes
      (1 reviews)
      # 80951338
      Subaru WRX United States 2003, Silicone Intakes by Mishimoto®. The Mishimoto Silicone Intake Boot is made from a combination of high-grade silicone and heat-resistant embedded fibers for a high-quality replacement kit for your OEM...
      Direct OEM fitManufactured from 100% high-grade silicone and heat-resistant embedded fibers
      $63.00 - $201.00
    • Mishimoto® Black Powdercoated Steel Airbox
      (0 reviews)
      # 80943024
      Subaru WRX United States 2003, Black Powdercoated Steel Airbox by Mishimoto®. Add some additional style and efficiency to your existing Mishimoto Performance Air Intake! This powdercoated, black airbox will divert more cold outside...
      Direct OEM fitManufactured from 100% high-quality materials
      $127.26
    • APEXi® Aluminum Induction Box
      (0 reviews)
      # 79118433
      Subaru WRX EJ20 Engine 2003, Aluminum Induction Box by APEXi®. The APEXi Aluminum Induction Box effectively shields the intake filter element from power robbing heat caused by turbocharged engines and extreme under the hood...
      $207.78
    • AVO® Power Air System
      (0 reviews)
      # 62401608
      Subaru WRX 2003, Power Air System by AVO®.
      $63.18 - $174.88
    • AVO® Silicone Intake System
      (0 reviews)
      # 62401611
      Subaru WRX 2003, Silicone Intake System by AVO®.
      $230.10
    • AVO® Cold Air Box Kit
      (0 reviews)
      # 61628342
      Subaru WRX 2003, Cold Air Box Kit by AVO®.
      $142.66
    • AVO® Flat Panel Air Filter
      (0 reviews)
      # 61628339
      Subaru WRX 2003, Flat Panel Air Filter by AVO®.
      $51.60
    • NPN® Air Filter
      (0 reviews)
      # 84195068
      Subaru WRX 2003, Air Filter by NPN®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste your...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $7.56 - $7.78
    • K&N® Apollo Cold Air Intake System
      (0 reviews)
      # 534642
      Apollo Cold Air Intake System by K&N®. Cooler air inlet temperatures mean more horsepower. This universal kit turns any air intake system into a Cold Air intake system. It replaces the OEM airbox with a K&N air filter in a special...
      $129.99 - $209.99
    • Spectre Performance® Air Intake Hump Hose
      (0 reviews)
      # 12037463
      Universal Air Intake Hump Hose by Spectre Performance®. Rooted in racing, Spectre Performance designs and builds every product with the same goal in mind - the best performance in the market proven on the racetrack! All products...
      High-tech engine parts for the most power and best performanceThe finest exterior and interior parts for superior appearance and functionality
      $32.40 - $37.02
    • Spectre Performance® Air Intake Tube Collar Clamp
      (0 reviews)
      # 12039508
      Universal Air Intake Tube Collar Clamp by Spectre Performance®. Rooted in racing, Spectre Performance designs and builds every product with the same goal in mind - the best performance in the market proven on the racetrack! All...
      High-tech engine parts for the most power and best performanceThe finest exterior and interior parts for superior appearance and functionality
      $8.52 - $12.78
    • AIRAID® Cone Air Filter
      (5 reviews)
      # 80390519
      Universal Cone Air Filter by AIRAID®. Advanced air filtration technology, superior construction and the world's best warranty make an AIRAID air filter the best you can buy. It allows increased airflow and provides better air...
      Improves airflow and engine performanceProvides superior air filtration and engine protection
      $25.40 - $109.04




    Guides & Articles

    • Performance Parts
      We all know that achieving better fuel economy while driving puts money back in your pocket and does the environment a favor. But for those who are actively interested in squeezing the most out of every drop of gas, getting more miles per gallon can actually become a sport - especially if a vehicle has a manual transmission that can be upshifted earlier and put into neutral during downhill grades or when coasting to a stop sign.
    • Performance Parts
      In today's world, saving money wherever possible has become essential. But it's important not to lose sight of the fact that, sometimes, a product that costs more up front will save you more money over time. In our business, we've seen far too many consumers judge products solely on the basis of their initial cost, completely neglecting any long-term economy and benefits. When it comes to automobiles, "performance" air filters are a perfect example of this.
    • Performance Parts
      Aftermarket air intake systems have become one of the most popular engine modifications available for late model cars and trucks. An easy question to ask is why are these so popular? After all, didn't engineers who work for your vehicle manufacturer spend years developing the best engine components available? Since power and fuel economy are major selling points these days, it's hard to imagine car companies not doing everything they can to maximize horsepower, miles per gallon, or both.
    • Performance Parts
      There are many types of aftermarket air intake systems that range from simple and inexpensive to elaborate. In the scope of this article, we'll examine the different types of air intakes, what they do, and look at a few specific product examples of each. But in short, performance air intake setups increase airflow into your engine - boosting combustion and creating more horsepower and torque that you can actually feel. Their relatively low cost and easy installation (bolt-on in most cases) keeps them in popular demand by car enthusiasts that own everything from 1.5-liter turbo motors to big block V8 engines.
    • Performance Parts
      An intake manifold is an integrated assembly that sits atop the engine, consisting of a series of tubes which distribute fresh outside air to each and every cylinder. On V-shaped engine blocks, an intake manifold typically sits between the two cylinder banks while inline engines may feature a manifold to the side of the cylinder head. Intake manifolds serve as a mounting point for carburetors, throttle body assemblies, fuel injectors, thermostats, and more depending on vehicle manufacturer engineering preferences. Intake manifolds may also serve to route coolant through dedicated channels in order to remove heat from the engine. Because of their location and functionality, intake manifold assemblies are under constant stress from engine vacuum pressure as well as direct heat from coolant, cylinder combustion gasses, and the cylinder heads to which they are mounted.

    Popular Products

    2003 Subaru WRX Performance Air Intake Systems Reviews

    Average rating:  4.5  4.5 - 1 reviews
    4.5 of 5
    Injen IS Short Ram for 2003 Subaru WRX
    Intake adds noticeable power and sounds fantastic under medium to hard acceleration. Moderately difficult to install because of having to removing air resonator chamber inside the front bumper. Even after that, it's a tight squeeze getting the intake to fit. Great product though and is totally worth the installation time. Be sure to monitor your air to fuel ratio after installation, your engine might be getting too much air and run lean.
    BPosted by Bryson (Oakville, ON) /
    2003 Subaru WRX
    Was this review helpful for you? Yes3   people found this review helpful.
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