2004 Subaru WRX Performance Exhaust Systems

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    • Flowmaster® dBX™ Stainless Steel Single Cat-Back Exhaust System
      (0 reviews)
      # 24459547
      Subaru WRX / WRX STI 2004, dBX™ Stainless Steel Single Cat-Back Exhaust System by Flowmaster®, MODERATE SOUND. DBX® Series Muffler. Single Rear Exit. 3" Tubing. 4" Polished Stainless Steel Tip. The dBX Series produces an exhaust...
      Mild - Moderate SoundCompact Case Fitting Compact Vehicles
      $455.34
    • MagnaFlow® Street Series Cat-Back Exhaust System
      (0 reviews)
      # 35201460
      Subaru WRX / WRX STI 2004, Street Series Cat-Back Exhaust System by MagnaFlow®, MODERATE SOUND. The Street Series is designed for customers seeking increased performance and better economy, combined with a powerful and well tuned...
      Moderate SoundDelivers More Horsepower
      $685.64 - $685.69
    • Borla® Stainless Steel Cat-Back Exhaust System
      (0 reviews)
      # 61459712
      Subaru WRX EJ205 2004, Stainless Steel Cat-Back Exhaust System by Borla®, AGGRESSIVE SOUND. Single Left Rear Exit. 4" Inlet / 8" Length Single Round Half-Rolled Angle-Cut Phantom Tip. 2.5" Tubing. When you want the best performing,...
      Throatier Exhaust NoteHorsepower and Torque Increased by 7 – 10%
      $535.99
    • Borla® Touring™ Stainless Steel Cat-Back Exhaust System
      (0 reviews)
      # 50386768
      Subaru WRX EJ205 2004, Touring™ Stainless Steel Cat-Back Exhaust System by Borla®, MILD GROWL SOUND. Dual Left Rear Exit. 3.19" x 6" Inlet / 6" Length Dual Round Rolled Angle-Cut Long Tips. 3" Tubing. When you want the best...
      Mild Growl SoundHorsepower and torque increased by 7 – 10%
      $679.99
    • Borla® S-Type™ Stainless Steel Cat-Back Exhaust System
      (0 reviews)
      # 26117591
      Subaru WRX STI EJ257 2004, S-Type™ Stainless Steel Cat-Back Exhaust System by Borla®, AGGRESSIVE PLUS SOUND, Single Left Rear Exit. 4.5" Inlet / 7.75" Length Single Round Rolled Angle-Cut Phantom Tip. 3" Tubing. When you want the...
      Aggressive Plus SoundIncreased exhaust flow for better performance
      $580.99
    • ARK Performance® N-II Stainless Steel Cat-Back Exhaust System with Polished Tip
      (0 reviews)
      # 16118542
      Subaru WRX 2004, N-II Stainless Steel Cat-Back Exhaust System with Polished Tip by ARK Performance®. 4.5" Single Tip. Tube Diameter: 3". The ARK N-II cat-back exhaust system offers straight-through technology, offset tip design,...
      All Bolt-on SystemStraight-through Muffler Core
      $881.30
    • Agency Power® Cat-Back Exhaust System
      (0 reviews)
      # 15847517
      Subaru WRX / WRX STI 2004, Cat-Back Exhaust System by Agency Power®. The Cat-Back is designed for customers seeking increased performance and better economy, combined with a powerful and well tuned exhaust note, making a real...
      Suitable for Everyday DrivingIncreases Power
      $800.00
    • DC Sports® Polished Stainless Steel Cat-Back Exhaust System
      (0 reviews)
      # 45401509
      Subaru WRX / WRX STI 2004, Polished Stainless Steel Cat-Back Exhaust System by DC Sports®. Single Canister. DC Sports race-inspired Single Canister systems are available for V6 and select four-cylinder application. Our Single...
      $517.26
    • Agency Power® Stainless Steel Header
      (0 reviews)
      # 15847894
      Subaru WRX 2004, Stainless Steel Header by Agency Power®. Adding a high quality exhaust header is a great way to gain power for your car. The Agency Power stainless steel exhaust header is constructed with quality in mind and the...
      Increases horsepower and torqueManufactured from 304 stainless steel
      $700.00
    • DC Sports® Polished Stainless Steel Turbo Manifold
      (0 reviews)
      # 11019108
      Subaru WRX / WRX STI 2004, Polished Stainless Steel Turbo Manifold by DC Sports®. DC Sports Turbo Manifolds are the perfect upgrade for customers looking to extract the most power from their factory turbocharged vehicle. Because of...
      $437.98
    • MagnaFlow® Direct Fit Federal OEM Grade Catalytic Converter
      (0 reviews)
      # 61590406
      Subaru WRX / WRX STI 2004, Direct Fit Federal OEM Grade Catalytic Converter by MagnaFlow®. 2.5" Inlet / Outlet Diameter. 7.63" Wide. Without Air Tube. If your car needs replacement, install one that will get you through the smog...
      Increases exhaust flow compared to original factory converterIncreased exhaust flow allows your engine to make more power
      $398.76 - $583.50
    • MagnaFlow® Direct Fit Federal Pre-OBDII Catalytic Converter
      (0 reviews)
      # 61590407
      Subaru WRX / WRX STI 2004, Direct Fit Federal Pre-OBDII Catalytic Converter by MagnaFlow®. 2.5" Inlet / 2.5" Outlet Diameter. 7.63" Wide. Without Air Tube. If your car needs replacement, install one that will get you through the...
      Increases exhaust flow compared to original factory converterIncreased exhaust flow allows your engine to make more power
      $320.31 - $485.43
    • DC Sports® Polished Stainless Steel Turbo Up-Pipe
      (1 reviews)
      # 45401513
      Subaru WRX / WRX STI 2004, Polished Stainless Steel Turbo Up-Pipe by DC Sports®. DC Sports competition pipes delete the catalytic to eliminate restriction in the exhaust path and are dyno tuned to deliver incredible performance...
      $114.41
    • Bosal® Rear Catalytic Converter
      (0 reviews)
      # 49846359
      Subaru WRX 2004, Rear Catalytic Converter by Bosal®. If you’re in need of a replacement catalytic converter, you can’t do better than Bosal. They’re a leading supplier to vehicle manufacturers and use advanced manufacturing...
      Constructed to meet your vehicle’s specific emissions requirementsRadial flow concept allows for an even distribution of the gas flow in the converter for the optimal conversion of harmful gases
      Call for Pricing
    • Eastern® Direct Fit Catalytic Converter
      (0 reviews)
      # 17569965
      Subaru WRX STI 2004, Direct Fit Pre Cat Catalytic Converter by Eastern Catalytic®. 24.5" Overall Length. ECO II. 5 Bolt Welded. 2 Bolt Welded. One Front Gasket. One Rear Gasket. If you need to replace your failed or damaged...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $237.06
    • Flowmaster® 40 Series Delta Flow™ Muffler
      (0 reviews)
      # 34441976
      Subaru WRX / WRX STI 2004, 40 Series Delta Flow™ Aluminized Steel Muffler by Flowmaster®, AGGRESSIVE SOUND, 2.25" Offset Inlet / 2.25" Center Outlet, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. The 2-chamber...
      The Quietest Option in the 40 Series Two Chamber LineLess Resonance than other 40 Series Mufflers
      $94.44
    • Flowmaster® 40 Series Delta Force™ Muffler
      (2 reviews)
      # 34439620
      Subaru WRX / WRX STI 2004, 40 Series Delta Force™ Aluminized Steel Muffler by Flowmaster®, AGGRESSIVE SOUND, 2.25" Offset Inlet / 2.25" Center Outlet, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. This is the...
      The Original High Performance Flowmaster MufflerAggressive Sound for the Enthusiasts Who Love Their Exhaust to be LOUD
      $81.32
    • Flowmaster® 40 Series Original Stainless Steel Muffler
      (0 reviews)
      # 34439621
      Subaru WRX / WRX STI 2004, 40 Series Original Stainless Steel Muffler by Flowmaster®, AGGRESSIVE SOUND, 2.25" Offset Inlet / 2.25" Center Outlet, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. This is the muffler...
      The Original High Performance Flowmaster MufflerAggressive Sound for the Enthusiasts Who Love Their Exhaust to be LOUD
      $87.08
    • Flowmaster® Super 44 Series Delta Flow™ Muffler
      (1 reviews)
      # 34441975
      Subaru WRX / WRX STI 2004, Super 44 Series Delta Flow™ Muffler by Flowmaster®, AGGRESSIVE SOUND, 2.25" Offset Inlet / 2.25" Center Outlet, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. The Super 44 has the...
      Deep, Aggressive, High Performance Exhaust NoteTwo-Chamber Design for Power and Torque Increase
      $83.90 - $94.44
    • Flowmaster® dBX Series™ Stainless Steel Laminar Flow Muffler
      (0 reviews)
      # 848580
      Subaru WRX / WRX STI 2004, dBX Series™ Stainless Steel Laminar Flow Muffler by Flowmaster®, MODERATE SOUND, 2.5" Center Inlet / 2.5" Center Outlet, 6" Diameter x 14" Case Length. dBX Laminar Flow mufflers have a patented core...
      Laminar Flow Muffler TechnologyCool Shell Technology for Low Exterior Heat
      $157.38
    • Skunk2® MegaPower™ Muffler
      (0 reviews)
      # 38815910
      Subaru WRX 2004, MegaPower™ Muffler by Skunk2®. 5.25" Canister. 2.25" Inlet Diameter. Skunk2 muffler is designed to maximize exhaust flow and power. Each muffler by Skunk2 is constructed from T-304 stainless steel and TIG welded...
      Increases performance by maximizing power and flowConstructed from T-304 stainless steel
      $157.99
    • Injen® Downpipe
      (0 reviews)
      # 379193
      Subaru WRX Sti 2004, Downpipe by Injen®. Eliminate restriction and maximize exhaust flow with this quality stainless steel downpipe.
      $302.18 - $439.88
    • Agency Power® Downpipes
      (0 reviews)
      # 15848165
      Subaru WRX 2004, Downpipes by Agency Power®. When adding an Agency Power Racing Downpipe to your turbo car, you will gain more horsepower and overall performance. The downpipe allows for better flow of the turbine and wastegate...
      Gives your vehicle a serious performance boostPrecision engineered for your vehicle
      $170.00 - $300.00
    • DC Sports® Polished Stainless Steel Turbocharger Downpipe
      (0 reviews)
      # 45401510
      Subaru WRX / WRX STI 2004, Polished Stainless Steel Turbocharger Downpipe by DC Sports®. DC Sports competition pipes delete the catalytic to eliminate restriction in the exhaust path and are dyno tuned to deliver incredible...
      $277.62
    • Spec-D® N1 Style Cat-Back Exhaust System (3" Inlet)
      (1 reviews)
      # 38833104
      Subaru WRX 2004, N1 Style Cat-Back Exhaust System (3" Inlet) by Spec-D®. Make whatever you drive run and sound like a high-performance machine with a Spec-D Exhaust System. The Spec-D system replaces your restrictive factory pipes...
      Dramatically improved exhaust flow compared to restrictive stock systemImproved engine breathing enables increased power output for better performance
      $160.20
    • Spec-D® N1 Style Cat-Back Exhaust System with Burnt Tip (3" Inlet)
      (1 reviews)
      # 38833103
      Subaru WRX 2004, N1 Style Cat-Back Exhaust System with Burnt Tip (3" Inlet) by Spec-D®. Make whatever you drive run and sound like a high-performance machine with a Spec-D Exhaust System. The Spec-D system replaces your restrictive...
      Dramatically improved exhaust flow compared to restrictive stock systemImproved engine breathing enables increased power output for better performance
      $160.20
    • DEC® Catalytic Converter
      (0 reviews)
      # 7642014
      Subaru WRX 2004, Catalytic Converter by DEC®. Position: Rear. Not legal for sale or use in California and New York. Note: (48-State and Canada) EPA Tier 0 and Tier 1 emission use. Is your car noisier these days? Can you smell...
      $322.21
    • Agency Power® Manifold Temp Reducer Gaskets
      (0 reviews)
      # 15847660
      Subaru WRX 2004, Manifold Temp Reducer Gaskets by Agency Power®. When switching from 4 lug to 5 lug hubs, the shock mounts for those wanting to use their existing shocks or coilovers will need spacers. These spacers fit in the...
      $40.00
    • Genuine® Exhaust Gasket
      (0 reviews)
      # 8922124
      Subaru WRX / WRX STI 2004, Exhaust Gasket by Genuine®. Note: Sealing Ring - Intermediate pipe to Main Catalyst. Is your car noisier these days? Can you smell exhaust fumes in the cabin? Exhaust system repairs should not be put off,...
      $31.40
    • Fel-Pro® Exhaust Manifold Gasket Set
      (0 reviews)
      # 57246272
      Subaru WRX / WRX STI 2004, Exhaust Manifold Gasket Set by Fel-Pro®. If you need durable gaskets to prevent leaks on your vehicle, Fel-Pro is the way to go. Engineered using the latest technologies and global engineering resources,...
      Direct OEM replacement for a proper fitEnsure reliable sealing performance
      $11.69
    • AJUSA® Exhaust Manifold Gasket
      (0 reviews)
      # 23005818
      Subaru WRX 2.0L 2004, Exhaust Manifold Gasket by AJUSA®. These gaskets seal components in the intake and exhaust systems of the vehicle such as the intake manifold, intake plenum, and exhaust manifold to the engine or other...
      Direct OEM replacement for a proper fitEnsure reliable sealing performance
      $7.16
    • Fel-Pro® Exhaust Pipe Flange Gasket
      (0 reviews)
      # 40720474
      Subaru WRX 2004, Exhaust Pipe Flange Gasket by Fel-Pro®. If you need durable gaskets to prevent leaks on your vehicle, Fel-Pro is the way to go. Engineered using the latest technologies and global engineering resources, the gaskets...
      Direct OEM replacement for a proper fitEnsure reliable sealing performance
      $8.07 - $19.00
    • Beck Arnley® Exhaust Manifold Gasket
      (0 reviews)
      # 52265954
      Subaru WRX / WRX STI 2004, Exhaust Manifold Gasket by Beck Arnley®. 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...
      OE quality products from top original equipmentTop quality materials
      $13.13
    • Flowmaster® 10 Series Delta Force Single Chamber Race Muffler
      (0 reviews)
      # 898490
      Universal 10 Series Delta Force Single Chamber Race Muffler by Flowmaster®, AGGRESSIVE SOUND. The 10 Series Race mufflers are a compact lightweight single chamber design that will give a noticeable sound reduction compared to open...
      Race Proven TechnologyNoticeable Sound Reduction Compared to Open Headers
      $75.62 - $146.90
    • Flowmaster® 30 Series Delta Force™ 3-Chamber Race Muffler
      (0 reviews)
      # 898450
      Universal 30 Series Delta Force™ 3-Chamber Race Muffler by Flowmaster®, AGGRESSIVE SOUND. These are the most powerful and the quietest professional race mufflers available. 5.00” & 6.00” thick case sizes for maximum power and...
      Race Proven TechnologyDelta Force Technology for Maximum Torque and Power
      $128.25 - $267.60
    • Flowmaster® 40 Series Delta Force™ 2-Chamber Race Muffler
      (0 reviews)
      # 898479
      Universal 40 Series Delta Force™ 2-Chamber Race Muffler by Flowmaster®, AGGRESSIVE SOUND. The 40-Series mufflers offer a combination of maximum power and substantial dB-reduction compared to open headers. They are recommended for...
      Race Proven TechnologyDelta Force Technology for Maximum Torque and Power
      $105.98 - $230.86
    • Flowmaster® 60 Series Delta Force Stainless Steel Race Muffler
      (0 reviews)
      # 3146020
      Universal 60 Series Delta Force Stainless Steel Race Muffler by Flowmaster®, MODERATE SOUND, 4" Offset Inlet / 4" Offset Outlet, 22" Length. These are the most powerful and the quietest professional race mufflers available.
      Race Proven TechnologyNoticeable Sound Reduction Compared to Open Headers
      $197.26
    • Flowmaster® Outlaw™ Race Muffler
      (1 reviews)
      # 898456
      Universal Outlaw™ Race Muffler by Flowmaster®, AGGRESSIVE SOUND. These mufflers are very small and lightweight. Attached directly to the collector they generally produce more power than open headers, while taking “the edge”...
      Race Proven TechnologyPure Race Muffler
      $89.00 - $134.32
    • Flowmaster® Pro Series Outlaw™ Race Muffler
      (0 reviews)
      # 62419096
      Universal Pro Series Outlaw™ Race Muffler by Flowmaster®, AGGRESSIVE SOUND. Inlet / Outlet Position: Center. Outlet Diameter: 3". Body Height: 5". Body Width: 5". Body Length: 9". These mufflers are very small and lightweight....
      Race Proven TechnologyPure Race Muffler
      $89.00
    • Flowmaster® Pro Series™ Stainless Steel Race Muffler with Turn Down
      (1 reviews)
      # 898465
      Universal Pro Series™ Stainless Steel Race Muffler with Turn Down by Flowmaster®, MODERATE SOUND, 6" Diameter x 16" Case Length. Laminar Flow Mufflers have applications in all forms of racing. The Cool Shell Technology makes...
      Race Proven Patented Laminar Flow TechnologyProven to Reduce dB Levels with no Reduction of Engine Performance Level
      $188.87
    • Flowmaster® Scavenger Series Outlaw II Race Collector Muffler
      (0 reviews)
      # 23297627
      Universal Scavenger Series Outlaw II Race Collector Muffler by Flowmaster®. These Delta Force Mufflers are designed to attach directly to the exhaust header primary tubes, replacing the collector in sprint and drag racing...
      Race Proven TechnologyAttach to Exhaust Header Primary Tubes
      $187.86 - $208.84
    • Flowmaster® Scavenger Series Race Collector Muffler
      (0 reviews)
      # 898468
      Universal Scavenger Series Race Collector Muffler by Flowmaster®. These Delta Force Mufflers are designed to attach directly to the exhaust header primary tubes, replacing the collector in sprint and drag racing applications. They...
      Race Proven TechnologyAttach to Exhaust Header Primary Tubes
      $167.54
    • Flowmaster® 40 Series Delta Flow™ Muffler
      (1 reviews)
      # 897054
      Universal 40 Series Delta Flow™ Muffler by Flowmaster®, AGGRESSIVE SOUND, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. The 2-chamber design of this muffler, incorporating the patented Flowmaster Delta Flow...
      The Quietest Option in the 40 Series Two Chamber LineLess Resonance than other 40 Series Mufflers
      $87.08 - $108.08
    • Flowmaster® 40 Series Original Muffler
      (0 reviews)
      # 897079
      Universal 40 Series Original Muffler by Flowmaster®, AGGRESSIVE SOUND, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. This is the muffler that launched the success of Flowmaster. It is an aggressive sounding...
      The Original High Performance Flowmaster MufflerrAggressive Sound for the Enthusiasts Who Love Their Exhaust to be LOUD
      $87.08
    • Flowmaster® 50 Series Delta Flow™ Muffler
      (1 reviews)
      # 897086
      Universal 50 Series Delta Flow™ Muffler by Flowmaster®, MODERATE SOUND, 4" Thick x 9.75" Wide x 17" Case Length x 23" Overall Length. The 50 Series Delta Flow mufflers are designed for passenger cars. The sound characteristics...
      Three Chamber Delta Flow TechnologyFully MIG-Welded for Maximum Durability
      $96.19 - $120.66
    • Flowmaster® 50 Series Delta Flow™ Slimline Muffler
      (0 reviews)
      # 897156
      Universal 50 Series Delta Flow™ Slimline Muffler by Flowmaster®, MODERATE SOUND. The 50 Series Delta Flow Slimline mufflers are designed for passenger cars. The sound characteristics are moderate exterior sound level and minimal...
      Three Chamber Delta Flow TechnologyFully MIG-Welded for Maximum Durability
      $134.99 - $139.56
    • Flowmaster® 60 Series Delta Flow™ Muffler
      (0 reviews)
      # 897052
      Universal 60 Series Delta Flow™ Aluminized Steel Muffler by Flowmaster®, MILD SOUND, 2.25" Center Inlet / 2.25" Center Outlet, 5" Thick x 10" Wide x 13" Case Length x 19" Overall Length. The 60 Series increases horsepower and...
      A Favorite With Import and Sport Compact OwnersBest When Matched for Four and Six Cylinder Engines
      $131.18
    • Flowmaster® 70 Series Delta Flow™ Big Block Muffler
      (0 reviews)
      # 897109
      Universal 70 Series Delta Flow™ Big Block Muffler by Flowmaster®, MILD SOUND, 5" Thick x 10" Wide x 22" Case Length x 28" Overall Length. The 70 Series Big Block II Muffler uses a longer case for increased volume and added...
      Quiet Muffler for Trucks and Big Power EnginesThree-Chamber Delta Flow Technology
      $152.15
    • Flowmaster® Pro Series™ Laminar Flow Muffler
      (0 reviews)
      # 897161
      Universal Pro Series™ Laminar Flow Muffler by Flowmaster®, MODERATE SOUND. PRO Laminar Flow mufflers have a patented core design that is characterized by efficient exhaust scavenging and minimized drone. They produce a rich, deep...
      The Most Versatile Laminar Flow Technology Muffler OfferedAvailable in Full Size and Shorty Versions
      $146.90 - $205.66
    • Flowmaster® Super 10 Series Delta Flow™ Stainless Steel Muffler
      (5 reviews)
      # 897126
      Universal Super 10 Series Delta Flow™ Stainless Steel Muffler by Flowmaster®, AGGRESSIVE SOUND, 4" Thick x 9.75" Wide x 5.50" Case Length x 12.50" Overall Length. If you want to be arrested, you should mount this muffler on your...
      The Most Aggressive Muffler Offered by FlowmasterRecommended for Racing Applications Only
      $69.99 - $73.44
    • Flowmaster® Super 40 Series Delta Flow™ Muffler
      (0 reviews)
      # 897132
      Universal Super 40 Series Delta Flow™ Muffler by Flowmaster®, AGGRESSIVE SOUND, 5" Thick x 10" Wide x 13.50" Case Length x 19.50" Overall Length. The Super 40 Series Delta Flow Mufflers are developed from the Top Ten muffler...
      Can Replace Any Other 40-Series MufflerDeeper and Richer Tone than Original 40 Series Muffler
      $104.92 - $109.49
    • Flowmaster® Super 44 Series Delta Flow™ Muffler
      (5 reviews)
      # 897136
      Universal Super 44 Series Delta Flow™ Muffler by Flowmaster®, AGGRESSIVE SOUND, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. The Super 44 has the deepest, richest, most aggressive muscle tone of all 4” street...
      Deep, Aggressive, High Performance Exhaust NoteTwo-Chamber Design for Power and Torque Increase
      $83.90 - $94.44
    • Flowmaster® Super HP-2™ Stainless Steel Performance Muffler
      (0 reviews)
      # 15943155
      Universal Super HP-2™ Stainless Steel Performance Muffler by Flowmaster®, 4" Thick x 5" Wide. The new Super HP-2 Series muffler offers the same great performance benefits and moderate tone that you would expect from our laminar...
      Moderate tone - perfect for performance and passenger cars409S Stainless Steel version backed by lifetime warranty
      $110.18 - $178.38
    • Flowmaster® Resonator
      (0 reviews)
      # 898502
      Universal Resonator by Flowmaster®. The resonators are designed for use in conjunction with Flowmaster Mufflers for improved sound reduction and minimize interior resonance.
      Reduce Interior ResonanceWork with Flowmaster Mufflers
      $79.68 - $124.88
    • MagnaFlow® Glass Pack Red Coated Aluminized Steel Muffler
      (0 reviews)
      # 61459909
      Universal Glass Pack Red Coated Aluminized Steel Muffler by MagnaFlow®. The Glass Pack Mufflers have the same high performance optimizing, straight-through design as the more expensive MagnaFlow mufflers. They are made in...
      Red Coated 100% aluminized steelNon-fiberglass acoustic packing material
      $35.14 - $51.26
    • Borla® S-Type™ Stainless Steel Round Muffler
      (12 reviews)
      # 25728287
      Universal S-Type™ Stainless Steel Round Muffler by Borla®. Get increased performance and the aggressive sound of power with this Universal S-Type Muffler. This is the same style austenitic stainless steel straight through muffler...
      Increased exhaust flow for better performanceDefinite performance tone at cruise with a throaty, aggressive sound during acceleration
      $175.99
    • Borla® XR-1™ Multicore Stainless Steel Race Muffler
      (0 reviews)
      # 959705
      Universal XR-1™ Multicore Stainless Steel Race Muffler by Borla®. The Borla XR-1 Multi-Core Muffler was developed on the race track to quiet the most severe engine noise without restricting power. They work so well that they're...
      The most possible exhaust flow in a muffler for maximum performanceQuiets the most severe engine noise, leaving a pronounced sound of power
      $244.99 - $469.99
    • Borla® Heavy Duty Stainless Steel Round Muffler
      (0 reviews)
      # 25728296
      Universal Heavy Duty Stainless Steel Round Muffler by Borla®, 3" Center Inlet / 3" Center Outlet. Get increased performance and the aggressive sound of power with this Heavy Duty Stainless Steel Round Muffler. This muffler includes...
      Increased exhaust flow for better performanceDefinite performance tone at cruise with a throaty, aggressive sound during acceleration
      $209.99
    • Gibson® CFT Superflow™ Oval Muffler
      (1 reviews)
      # 2060024
      Universal CFT Superflow™ Oval Muffler by Gibson®. Get optimum usable power and a deep powerful sound with a Gibson CFT Superflow Muffler. The CFT Superflow has one of the lowest restriction ratings of any muffler on the market,...
      Chambered and louvered design for increased exhaust flowDirectional louvered tuning ports for maximum exhaust flow
      $77.39 - $123.90
    • Gibson® SFT Superflow™ Round Muffler
      (2 reviews)
      # 2060137
      Universal SFT Superflow™ Round Muffler by Gibson®. Get increased exhaust flow for more power and great sound with a Gibson SFT Superflow Muffler. The SFT Superflow has one of the lowest restriction ratings of any muffler on the...
      Baffled and chambered structure for increased exhaust flowStraight through design increases exhaust flow
      $84.40 - $262.74



    Guides & Articles
    Regardless of whether you're shopping for a simple replacement muffler that delivers original equipment (OE) sound and performance or an upgraded muffler which provides a deeper growl with increased power through freer exhaust flow, you'll see choices between "direct fit" mufflers and "universal" mufflers. In this article, we'll help you understand the differences...
    It has been a battle of the ages to make exhaust sound like it should. Having less bends or turns will not only improve the sound but also performance. A custom exhaust is always an option for the race inspired and spirited weekend warriors. Our manufactures offer everything needed to build a custom exhaust to your preference.
    Headers are installed because the stock exhaust manifolds usually flow poorly. An exhaust header has individual tubes for each exhaust port, allowing each exhaust pulse to flow unobstructed from the cylinder head. The tubes on headers are usually larger in diameter than the runners on an exhaust manifold and the tubes are mandrel bent for gradual radius bends.
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    2004 Subaru WRX Performance Exhaust Systems Reviews
    Average rating: 5 5 - 1 reviews
    (5)
    APPEARANCE
    EASE OF INSTALLATION
    PRICE/VALUE
    QUALITY
    2003 Subaru WRX | Posted by William | (Abiquiu, NM)

    Overall wonderful experience. From ordering the system to delivery and installation. And the sound is just right. Would highly recommend ordering this product from this company!

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    2004 Subaru WRX Models
    • 2004 Subaru Impreza WRX Performance Exhaust Systems
    • 2004 Subaru Impreza WRX STI Performance Exhaust Systems