2004 Subaru WRX Emission Control

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    • Bosch® Premium Oxygen Sensor
      (0 reviews)
      # 35994372
      Subaru WRX 2004, Premium Oxygen Sensor by Bosch®. Location: Downstream. A worn-out oxygen sensor can cause engine performance problems and shorten the life of the catalytic converter. Tune-up your vehicle with an Oxygen Sensor...
      Up to 15 % savings in fuel costsReduced CO2 emissions
      $62.12 - $66.33
    • Bosch® Universal Fit Oxygen Sensor
      (0 reviews)
      # 24136862
      Subaru WRX / WRX STI 2004, Universal Fit Oxygen Sensor by Bosch®. Location: Downstream. Properly functioning oxygen sensors are important when it comes to your vehicle's fuel efficiency and reducing harmful exhaust emissions....
      Up to 15 % savings in fuel costsReduced CO2 emissions
      $39.04
    • Bosch® Wideband Oxygen Sensor
      (0 reviews)
      # 35994368
      Subaru WRX 2004, Wideband Oxygen Sensor by Bosch®. Location: Upstream. This sensor utilizes a sophisticated sensing element enabling it to produce a precise output in proportion to the air/fuel ratio. The A/F sensor measures...
      Detects the exact amount of unburned fuel in the exhaust streamOE connectors and OE-style harness for continuous wire from connector to sensor
      $117.80 - $171.31
    • Standard® Downstream Oxygen Sensor
      (1 reviews)
      # 45000611
      Subaru WRX 2004, Downstream Oxygen Sensor by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $56.00 - $73.65
    • Hitachi® Oxygen Sensor
      (0 reviews)
      # 22063980
      Subaru WRX STI 2.5L 2004, Oxygen Sensor by Hitachi®. This is an aftermarket part that replaces factory OE # 22690AA640. This sensor is manufactured using the latest electronic-sensing technology to ensure accurate measurement of...
      Ensures precise measurement of exhaust gas oxygen contentMeets or exceeds OE specifications
      $176.29
    • Denso® Downstream OE Connector Oxygen Sensor
      (0 reviews)
      # 21071902
      Subaru WRX / WRX STI 2004, Downstream OE Connector Oxygen Sensor by Denso®. Heated. Screw Type. 4 Wires, 21.26" / 54.00 cm Length. Denso's light duty oxygen sensor started to appear on vehicles with the development of fuel...
      Corrosion-resistant stainless steel constructionPTFE filter blocks efficiency-robbing contaminants
      $54.70
    • Denso® Upstream OE Connector Air Fuel Ratio Sensor
      (0 reviews)
      # 21104193
      Subaru WRX 2004, Upstream OE Connector Air Fuel Ratio Sensor by Denso®. 4 Wires. The air/fuel ratio sensor sends information to the engine management computer to makes adjustments based on driving conditions. This wider range and...
      Tarnish-proof platinum electrodes provides longer life and maintains accuracyQuick-response planar zircon element can quickly detect oxygen concentration
      $106.77 - $128.97
    • Walker Products Inc.® Air Fuel Ratio Sensor
      (0 reviews)
      # 8739923
      Subaru WRX STI 2004, Air Fuel Ratio Sensor by Walker Products Inc.®. Is your vehicle hard to start? Does its stumble and stall, and idle rough? Are you making more frequent visits to the pump? Your fuel system may need repair, but...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $169.26
    • Walker Products Inc.® OE Connector Oxygen Sensor
      (0 reviews)
      # 8739924
      Subaru WRX / WRX STI 2004, OE Connector Oxygen Sensor by Walker Products Inc.®. Position: Rear. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of...
      $92.25
    • NTK® Air-Fuel Ratio Sensor
      (0 reviews)
      # 78810194
      Subaru WRX 2004, Upstream Air-Fuel Ratio Sensor by NTK®. OE Replacement. Air/Fuel ratio sensors utilize a sophisticated sensing element that enables them to produce a precise output in proportion to the air/fuel ratio. AFR sensors...
      Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
      $142.90 - $200.79
    • NTK® Oxygen Sensor
      (0 reviews)
      # 22131744
      Subaru WRX / WRX STI 2004, Downstream Oxygen Sensor by NTK®. OE Replacement. This product is designed to improve engine efficiency and fuel mileage, while reducing emissions and extending catalyst life. The oxygen sensor is made of...
      Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
      $71.33
    • Genuine® PCV Valve
      (0 reviews)
      # 8801306
      Subaru WRX STI 2.5L 2458 2004, PCV Valve by Genuine®. Do you hear a humming or growling sound as you drive, or a clicking or clunking noise when cornering? If so, your vehicle may need wheel bearing or drive axle repairs. But...
      $23.87
    • Moroso® Air-Oil Separator
      (0 reviews)
      # 85013469
      Subaru WRX 2004, Air-Oil Separator by Moroso®. With this quality part backed by a great price, you can enjoy your vehicle so much more than you thought was possible. This Moroso part is specifically engineered to make your vehicle...
      Plumbed into a vehicle's PCV system to capture the excess crankcase vapors, residual oil mist and moisture from reentering the intake tractVehicles from the factory vent these excess crankcase vapors, residual oil mist and moisture right back into the intake manifold which could cause detonation, oil deposits to form in the intake tract including the valves themselves and from lowering the ficiency of the intercooler in intercooler equipped vehicles
      $303.71 - $356.11
    • Standard® Intermotor™ Vapor Canister
      (0 reviews)
      # 45113591
      Subaru WRX / WRX STI 2004, Intermotor™ Vapor Canister by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $82.81
    • Genuine® Carbon Canister
      (1 reviews)
      # 88054855
      Subaru WRX 2004, Carbon Canister by Genuine®. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of repair, but before you waste your time and gas...
      $120.80
    • Genuine® Carbon Canister
      (1 reviews)
      # 8798136
      Subaru WRX / WRX STI 2004, Carbon Canister by Genuine®. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of repair, but before you waste your time...
      $120.80
    • Eastern® ECO II Direct Fit Front Catalytic Converter
      (0 reviews)
      # 17569965
      Subaru WRX STI 2.5L 2004, Direct Fit Front Catalytic Converter by Eastern®. Catalytic Series: ECO II. Converter Configuration: Direct Fit. Catalytic Converter Format: Pre-Catalytic Converter. No Catalytic Converter Overall Length:...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $225.01
    • AP Exhaust® Direct Fit Catalytic Converter
      (0 reviews)
      # 80149919
      Subaru WRX STI CARB Compliant / EPA Compliant 2004, Direct Fit Catalytic Converter by AP Exhaust®. The growing concern for the environment means there is a growing need for quality emission control products. AP catalysts and...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $230.25 - $288.39
    • Bosal® Direct Fit Catalytic Converter
      (0 reviews)
      # 88880502
      Subaru WRX / WRX STI 2004, Direct Fit Catalytic Converter by Bosal®. Converter Configuration: Direct Fit. CARB Compliant: No. If you’re in need of a replacement catalytic converter, you can’t do better than Bosal. They’re a...
      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
      $145.34 - $290.05
    • DEC® Catalytic Converter and Pipe Assembly
      (0 reviews)
      # 86066730
      Subaru WRX / WRX STI 2.0L 2004, Catalytic Converter and Pipe Assembly by DEC®. With Pipe Assembly and O2 Sensor. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $205.03
    • DEC® Direct Fit Catalytic Converter
      (0 reviews)
      # 86075000
      Subaru WRX / WRX STI 2.0L 2004, Direct Fit Catalytic Converter by DEC®. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are made from a heavy...
      Direct fitMade from a heavy duty stainless steel outer shell
      $212.40 - $245.00
    • MagnaFlow® Direct Fit Federal OEM Grade Catalytic Converter with Header
      (0 reviews)
      # 98137062
      Subaru WRX 2004, Direct Fit Federal OEM Grade Catalytic Converter with Header by MagnaFlow®. Catalytic Converter Substrate Material: Ceramic. Converter Body Material: Stainless Steel. Location: Front. CARB Compliant: No. Converter...
      Reduces harmful emissionsIncreases exhaust flow compared to original factory converter
      $583.50
    • MagnaFlow® Direct Fit Federal OEM Grade Rear Catalytic Converter
      (0 reviews)
      # 85644769
      Subaru WRX / WRX STI 2004, Direct Fit Federal OEM Grade Catalytic Converter by MagnaFlow®. Catalytic Converter Substrate Material: Ceramic. Converter Body Material: Stainless Steel. Location: Rear. CARB Compliant: No. Converter...
      Reduces harmful emissionsIncreases exhaust flow compared to original factory converter
      $398.76
    • MagnaFlow® Direct Fit Federal Standard Catalytic Converter
      (0 reviews)
      # 61590407
      Subaru WRX 2004, Direct Fit Federal Standard Catalytic Converter by MagnaFlow®. Catalytic Converter Substrate Material: Ceramic. Converter Body Material: Stainless Steel. CARB Compliant: No. Converter Configuration: Direct-Fit....
      Converter body manufactured from heavy-duty stainless steelIncreases exhaust flow compared to original factory converter
      $320.31 - $485.43
    • Genuine® Purge Valve
      (1 reviews)
      # 8804939
      Subaru WRX / WRX STI 2004, Purge Valve by Genuine®. Note: Located Next to Intake Manifold. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of...
      $47.74
    • Genuine® Purge Valve
      (1 reviews)
      # 88054864
      Subaru WRX 2004, Purge Valve by Genuine®. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of repair, but before you waste your time and gas running...
      $47.74
    • PERRIN Performance® Air Oil Separator Kit
      (0 reviews)
      # 73693734
      Subaru WRX 2004, Air Oil Separator Kit by PERRIN Performance®. The PERRIN Performance Air Oil Separator traps oil from the crank case vents before it enters the intake, thus increasing intercooler efficiency and reduces chances of...
      Increases intercooler efficiencyReduces carbon build up
      $382.50
    • Standard® Intermotor™ Vapor Canister Purge Solenoid
      (0 reviews)
      # 45264031
      Subaru WRX 2004, Intermotor™ Vapor Canister Purge Solenoid by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $91.78 - $116.23
    • Standard® Intermotor™ Vapor Canister Vent Solenoid
      (0 reviews)
      # 45113557
      Subaru WRX / WRX STI 2004, Intermotor™ Vapor Canister Vent Solenoid by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $55.68
    • Dorman® Vapor Canister Vent Solenoid
      (0 reviews)
      # 16858383
      Subaru WRX / WRX STI 2004, Vapor Canister Vent Solenoid by Dorman®. This is an aftermarket part that replaces factory OE # 42084FA120. Dorman’s Vapor Canister Vent Solenoid is engineered from robust materials to effectively...
      Replacement helps to reduce atmospheric pollution due to hydrocarbon emissionsHigh-quality design for prolonged durability against harsh road and weather conditions
      $43.60
    • Genuine® Passenger Side EGR Vacuum Solenoid
      (0 reviews)
      # 88054858
      Subaru WRX 2004, Passenger Side EGR Vacuum Solenoid by Genuine®. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle’s emissions control system is in need of repair, but before you waste...
      $136.07 - $172.36
    • Dorman® Engine Oil Separator Cover
      (0 reviews)
      # 16852464
      Subaru WRX / WRX STI 2004, Engine Oil Separator Cover by Dorman®. This is an aftermarket part that replaces factory OE # 11831AA150. Featuring a stamped steel design to improve upon the original, failure-prone plastic materials,...
      Oil- and heat- resistantDirect replacement for a proper fit
      $23.42
    • Genuine® Breather Hose
      (0 reviews)
      # 8886383
      Subaru WRX 2004, Breather Hose by Genuine®. Do you hear a humming or growling sound as you drive, or a clicking or clunking noise when cornering? If so, your vehicle may need wheel bearing or drive axle repairs. But before you...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $9.93 - $48.00
    • Moroso® Air-Oil Separator PCV Delete Kit (85699)
      (0 reviews)
      # mpn358583092
      Universal, Air-Oil Separator PCV Delete Kit by Moroso®. With this quality part backed by a great price, you can enjoy your vehicle so much more than you thought was possible. This Moroso part is specifically engineered to make your...
      $98.86
    • Eastern® ECO GM Universal Fit Large Round Catalytic Converter
      (0 reviews)
      # 100278342
      Universal Fit Catalytic Converter by Eastern®. Catalytic Series: ECO GM. Converter Configuration: Universal Fit. Catalytic Converter Format: Main Catalytic Converter. No Catalytic Converter Body Length: 12". Catalytic Converter...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $83.88 - $88.68
    • Eastern® ECO III Universal Fit Oval Catalytic Converter
      (0 reviews)
      # 100278390
      Universal Fit Catalytic Converter by Eastern®. Catalytic Series: ECO III. Converter Configuration: Universal Fit. Catalytic Converter Format: Main Catalytic Converter. No Without Inlet Gasket. Without Outlet Gasket. Keep your...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $69.41 - $108.03
    • Eastern® ECO II Universal Fit Oval Catalytic Converter
      (0 reviews)
      # 100278495
      Universal Fit Catalytic Converter by Eastern®. Catalytic Series: ECO II. Converter Configuration: Universal Fit. Catalytic Converter Format: Main Catalytic Converter. No Without Inlet Gasket. Without Outlet Gasket. Keep your...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $66.23 - $87.13
    • Eastern® Standard Universal Fit Oval Catalytic Converter
      (0 reviews)
      # 100278621
      Universal Fit Catalytic Converter by Eastern®. Catalytic Series: Standard. Converter Configuration: Universal Fit. Catalytic Converter Format: Main Catalytic Converter. No Without Inlet Gasket. Without Outlet Gasket. Without Oxygen...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $46.37 - $65.22
    • BTP® Crankcase Evacuation System (7317)
      (0 reviews)
      # mpn753352631
      Universal Crankcase Evacuation System by BTP®. Designed utilizing the latest technology, this product delivers the performance you've been looking for. With this second-to-none part by BTP you will keep emission control system in...
      Designed for better performance of your emission control systemRight for your vehicle and lifestyle
      $34.74
    • BTP® Polished Aluminum PCV Valve (8489)
      (1 reviews)
      # mpn753352945
      Universal Polished Aluminum PCV Valve by BTP®. 3/4" O.D. Neck. 3/8" Tube. Designed utilizing the latest technology, this product delivers the performance you've been looking for. With this second-to-none part by BTP you will keep...
      Designed for better performance of your emission control systemRight for your vehicle and lifestyle
      $20.07
    • Vibrant Performance® Oil Catch Can
      (0 reviews)
      # 78902539
      Universal Oil Catch Can by Vibrant Performance®. Vibrant Performance offers the most versatile Universal Catch Cans on the market. Made entirely from T6061 Aluminum, it is suitable for various types of service: Oil, Fluid (i.e....
      Top End Cap is pressure fitEach End Cap also features a port tapped for 3/4” NPT fittings, perfect for running a breather filter off your Catch Can
      $102.38
    • Peterson® One Way Inline Pop Off Valve
      (0 reviews)
      # 82368344
      Universal One Way Inline Pop Off Valve by Peterson Fluid Systems®. Breather assembly is installed in line from engine's crankcase. Valve seals engine from air entering engine, but opens in the event of crankcase pressure, allowing...
      Protects the pump in case of catastrophic engine failureMade of high quality Aluminum
      $123.83 - $128.15
    • Peterson® Remote Breather Can
      (0 reviews)
      # 82368371
      Universal Remote Breather Can by Peterson Fluid Systems®. Peterson remote breather cans with internal baffeling are excellent when breathing your dry sump tank to atmosphere or running a vacuum system.
      Made of high quality AluminumInternally baffled
      $182.24 - $184.94
    • Peterson® Vacuum Regulator (08-0455)
      (0 reviews)
      # mpn358504774
      Universal Vacuum Regulator by Peterson Fluid Systems®. Peterson's new adjustable vacuum regulator is on the leading edge of engine management. It has been proven to regulate crankcase vacuum and hold a steady level through...
      Regulates crankcase vacuumMade of high quality billet Aluminum
      $194.39
    • GREEN FILTER® Crankcase Air Filter
      (1 reviews)
      # 2565187
      Universal Crankcase Air Filter by Green Filter®. Route your crankcase breather into one of these filters to keep dirt and bugs from entering your crankcase. It’s easy to clean, and will soak up some glop that otherwise would wind...
      Cotton element catches oily blow-bySteel mesh resists denting
      $16.79 - $20.99
    • Radium® Catch Can Kit
      (0 reviews)
      # 89034274
      Universal Catch Can Kit by Radium®. An oil catch can is essential on a performance vehicle to protect the engine from elevated levels of crankcase blow-by accumulated from aggressive driving. Excess oil saturated air circulating...
      $157.65 - $299.20
    • Radium® Competition Catch Can
      (0 reviews)
      # 89034280
      Universal Competition Catch Can by Radium®. The Radium Competition Catch Can (CCC) was created to provide motorsports participants with a high quality product that meets the common 1 Quart minimum capacity requirements dictated by...
      $332.45 - $379.95
    • Vibrant Performance® GESI® High Output Catalytic Converters
      (0 reviews)
      # 78902206
      Universal GESI® High Output Catalytic Converters by Vibrant Performance®. Vibrant Performance and Global Emissions Systems Inc. (GESi®) have teamed up to supply a series of OBD2 (1996 and newer) high flow Catalytic Converters...
      EPA certified for use on OBD2 vehicles (1996 and newer) in jurisdictionswhere the installation of Universal Catalytic Converters is still permitted
      $335.21 - $448.35
    • Vibrant Performance® High Output Catalytic Converters
      (0 reviews)
      # 78902217
      Universal High Output Catalytic Converters by Vibrant Performance®. Vibrant Performance Metal or Ceramic Core Catalytic Converters are made entirely of Stainless Steel and feature a Monolith that is far more durable and capable...
      T304 Stainless Steel ConstructionThese Converters are covered by a 5 year / 50,000 mile warranty
      $75.76 - $109.10
    • Dynatech® PowerCat Stainless Steel Catalytic Converter
      (0 reviews)
      # 84198005
      Universal PowerCat Stainless Steel Catalytic Converter by Dynatech®. 1 Piece. The Dynatech PowerCAT catalytic convertor uses the latest technology in catalytic convertor design. Utilizing a Premium Metallic Substrate internal...
      Premium metallic substrateSuperior strength and durability
      $174.99
    • Thunderbolt® Car Diesel Catalytic Converter
      (1 reviews)
      # 82989181
      Universal Car Diesel Catalytic Converter by Thunderbolt®. 4" Round x 11" Long. These superior quality products are carefully engineered to improve exhaust flow and boost power of your vehicle. These Thunderbolt performance exhaust...
      Designed to improve exhaust flowBuilt to enhance the performance of your vehicle
      $79.39
    • Thunderbolt® Oval Catalytic Converter
      (1 reviews)
      # 82989467
      Universal Oval Catalytic Converter by Thunderbolt®. These superior quality products are carefully engineered to improve exhaust flow and boost power of your vehicle. These Thunderbolt performance exhaust products also help your...
      Designed to improve exhaust flowBuilt to enhance the performance of your vehicle
      $39.69 - $76.06
    • Thunderbolt® The Spun Formed Catalytic Converter
      (0 reviews)
      # 82989388
      Universal The Spun Formed Catalytic Converter by Thunderbolt®. These superior quality products are carefully engineered to improve exhaust flow and boost power of your vehicle. These Thunderbolt performance exhaust products also...
      Designed to improve exhaust flowBuilt to enhance the performance of your vehicle
      $44.46 - $76.22
    • Thunderbolt® Truck Diesel Catalytic Converter
      (0 reviews)
      # 82989593
      Universal Truck Diesel Catalytic Converter by Thunderbolt®. 6" Round x 12" Long. These superior quality products are carefully engineered to improve exhaust flow and boost power of your vehicle. These Thunderbolt performance...
      Designed to improve exhaust flowBuilt to enhance the performance of your vehicle
      $183.83
    • Stainless Works® 304 SS High-Flow Catalytic Converter
      (0 reviews)
      # 83115043
      Universal 304 SS High-Flow Catalytic Converter by Stainless Works®. CARB Compliant: No. This superior product is made from high-grade stainless steel to ensure excellent quality and maximum resistance to corrosion. Engineered with...
      Designed to meet strict quality standardsCarefully crafted from first-rate stainless steel
      $184.50
    • Vibrant Performance® J-Style Oxygen Sensor Restrictor Fitting (11619)
      (0 reviews)
      # mpn458109083
      Universal J-Style Oxygen Sensor Restrictor Fitting by Vibrant Performance®. A standard O2 Sensor threads into the female end of this fitting. Insert one of the three included inserts to restrict exhaust gas flow to the O2 Sensor...
      $33.00
    • Vibrant Performance® Oxygen Sensor Fitting
      (0 reviews)
      # 78902547
      Universal Oxygen Sensor Fitting by Vibrant Performance®. Vibrant Performance E-Vac Scavenger Kits are designed to pull as much as 3 inch lbs. of vacuum from a typical race engine, improving horsepower and reducing crankcase...
      Made of High Quality MaterialsAvailable in different sizes
      $2.00 - $241.40
    • Vibrant Performance® Oxygen Sensor Restrictor Fitting (11621)
      (0 reviews)
      # mpn358596199
      Universal Oxygen Sensor Restrictor Fitting by Vibrant Performance®. A standard O2 Sensor threads into the female end of this fitting. Insert one of the three included inserts to restrict exhaust gas flow to the O2 Sensor and retain...
      $20.95
    • Innovate Motorsports® O2 Sensor Clamp (3728)
      (0 reviews)
      # mpn358501228
      Universal O2 Sensor Clamp by Innovate Motorsports®. Patent-pending, venturi-effect, tapped exhaust clamp for obtaining accurate lambda measurements in non-cat autos or other engines.
      $77.19
    • Vibrant Performance® Crankcase Breather Filter with Chrome Cap
      (0 reviews)
      # 78901973
      Universal Crankcase Breather Filter with Chrome Cap by Vibrant Performance®. Vibrant Performance These compact filters are perfect for use on engine bays where space is limited.
      Made of High Quality MaterialsAvailable in different sizes
      $7.30




    Guides & Articles

    • Replacement Emission Control Parts
      Oxygen Sensors - Why Does My Car Have Four, And Can I Replace One Myself?
      An oxygen sensor (also known as an O2 sensor or Lambda sensor) is a sensor designed to generate a reading based on the content of oxygen in an automotive exhaust system. The sensor itself is made of a ceramic compound with porous-shaped electrodes coated in platinum, surrounded by a protective metal shell casing. O2 sensor casings are threaded, and the entire unit is designed to screw in until it reaches a half-in, half-out position on the exhaust pipe. Modern oxygen sensors are heated to ensure they reach operating temperature quickly.
    • Ignition Parts
      Auto Parts: Dealer vs. Aftermarket
      The question of whether to buy parts from an automotive dealer vs. ones from aftermarket manufacturers is as age-old as the automobile itself. Below, we'll take a look at things worth considering to help you make a better choice if you're facing that same question. Automobile manufacturers and dealerships always advertise the fact that their parts are "genuine" because they were made by the exact same production facility that made the parts installed on the assembly line.

    Popular Products

    2004 Subaru WRX Emission Control Reviews

    Average rating:  4.5  4.5 - 3 reviews
    4.8 of 5
    Good Purchase
    Recently I have mounted new cat. My purchase has a faultless casing and everything measures up perfectly. That's nice deal for my Dodge, because the sound great. I like the tonality of these high flow catalytic if your looking for high flow cats these are the way to go.
    CPosted by Craig Walters (Louisbourg, NS) /
    Was this review helpful for you? Yes
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    2004 Subaru WRX Models
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