2004 Subaru WRX Emission Control

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    • (0 reviews)
      # 35994365
      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
      $61.91 - $67.44
    • (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
      $38.92
    • (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
      $119.41 - $173.09
    • (1 review)
      # 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
      $53.53 - $73.65
    • (0 reviews)
      # 81776462
      Subaru WRX 2004, Oxygen Sensor by Delphi®. Connector Type: Square-4 Blade. Wrench Size: 7/8". As one of the leading suppliers of oxygen sensor technology since 1978, Delphi planar technology is the result of their OE and...
      OE connectors and wire lengths within three inches of OE specificationsResists high temperatures, vibration damage and wire corrosion to protect signal accuracy, and long life
      $59.64 - $181.06
    • (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
      $56.94
    • (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
      $111.39 - $134.80
    • (0 reviews)
      # 95333064
      Subaru WRX 2004, Downstream Oxygen Sensor by Spectra Premium®. To ensure your vehicle has optimal performance and fuel economy while producing minimal emissions replace a defective O2 sensor with one backed by the aftermarket’s...
      Increase vehicle fuel economy and engine performance while decreasing vehicle exhaust emissions100% performance tested to meet vehicle requirements
      $51.15
    • (0 reviews)
      # 152247052
      Subaru WRX 2004, Downstream Oxygen Sensor by NTK®. Location: B1S2. OE Equivalent This product is designed to improve engine efficiency and fuel mileage, while reducing emissions and extending catalyst life. The oxygen sensor is...
      Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
      $72.33
    • (0 reviews)
      # 86086617
      Subaru WRX 2004, Professional™ Positive Crank Ventilation Valve by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $7.25
    • (0 reviews)
      # 8801306
      Subaru WRX STI 2.5L 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 before you...
      $23.44
    • (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
      $321.53 - $356.11
    • (0 reviews)
      # 45113260
      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
      $80.73
    • (1 review)
      # 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 and...
      $121.30
    • (1 review)
      # 257003441
      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...
      $121.30
    • (0 reviews)
      # 211530080
      Subaru WRX 2004, Catalytic Converter by Walker®. Converter Configuration: Universal Fit. Location: Rear. Converter Body Material: Stainless Steel. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape:...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $85.64
    • (0 reviews)
      # 17569965
      Subaru WRX STI 2.5L 2004, ECO II Catalytic Converter by Eastern®. Catalytic Series: ECO II. Converter Configuration: Direct Fit. Location: Front Undercar. Catalytic Converter Substrate Material: Ceramic. Inlet Connection Type: 5...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $231.04
    • (0 reviews)
      # 100278013
      Subaru WRX STI 2.5L 2004, ECO II Catalytic Converter by Eastern®. Catalytic Series: ECO II. Converter Configuration: Universal Fit. Location: Front Undercar. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $56.54
    • (0 reviews)
      # 88860736
      Subaru WRX STI 2.5L 2004, Standard Catalytic Converter by Eastern®. Catalytic Series: Standard. Converter Configuration: Direct Fit. Location: Rear Undercar. Catalytic Converter Substrate Material: Ceramic. Inlet Connection Type: 2...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $177.45
    • (0 reviews)
      # 172053797
      Subaru WRX 2004, Catalytic Converter by Eastern®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Whether your catalytic converter is damaged by road debris or failed due to an engine problem, you...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $46.62 - $90.50
    • (0 reviews)
      # 80149919
      Subaru WRX STI 2.5L 2004, Catalytic Converter by AP Exhaust®. Converter Configuration: Direct Fit. Converter Body Material: Stainless Steel. Catalytic Converter Substrate Material: Ceramic. Outlet Type A: 2 Bolt Welded Flange....
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $230.25 - $295.13
    • (0 reviews)
      # 212123563
      Subaru WRX With Federal Emission 2004, Catalytic Converter by Bosal®. Converter Configuration: Direct Fit. If you’re in need of a replacement catalytic converter, you can’t do better than Bosal. They’re a leading supplier to...
      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 - $297.82
    • (0 reviews)
      # 86075000
      Subaru WRX / WRX STI 2.0L 2004, Catalytic Converter by DEC®. Converter Configuration: Direct Fit. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic...
      Direct fitMade from a heavy duty stainless steel outer shell
      $205.03 - $362.60
    • (0 reviews)
      # 198284242
      Subaru WRX 2004, Catalytic Converter by Davico®. Converter Configuration: Direct Fit. This direct-fit catalytic converter by Davico will be a great solution to replace your failed or damaged catalytic converter. Once your stock cat...
      Helps your vehicle emit harmless gasesDirect OEM replacement
      $218.06 - $270.14
    • (0 reviews)
      # 98837081
      Subaru WRX / WRX STI 2004, Dual Catch Can Kit by Radium®. Includes: 2x Black Anodized and Laser Engraved Billet Aluminum Catch Cans, 4x Black Anodized -AN Aluminum Adapter Fittings, 4x Black Anodized 90 Degree -AN Hose Ends, 1x...
      Effectively raises the octane and increases engine performance with cleaner inlet airPrevents oil buildup in the intake or intercooler system walls, throttle body, intake manifold, etc.
      $427.45
    • (0 reviews)
      # 85644768
      Subaru WRX / WRX STI 2004, OEM Grade Stainless Steel Exhaust Manifold with Integrated Catalytic Converter by MagnaFlow®. Primary Tubing Diameter: 2". Material: Stainless Steel. Converter Configuration: Direct Fit. Series: OEM...
      Reduces harmful emissionsIncreases exhaust flow compared to original factory converter
      $583.50
    • (0 reviews)
      # 57879893
      Subaru WRX 2004, Heavy Metal Catalytic Converter by MagnaFlow®. Catalytic Series: Heavy Metal. Converter Configuration: Universal Fit. Converter Body Material: Stainless Steel. Catalytic Converter Substrate Material: Ceramic....
      Reduces harmful emissionsIncreases exhaust flow compared to original factory converter
      $100.27 - $105.95
    • (0 reviews)
      # 85644769
      Subaru WRX / WRX STI 2004, OEM Grade Catalytic Converter by MagnaFlow®. Catalytic Series: OEM Grade. Converter Configuration: Direct Fit. Location: Rear. Converter Body Material: Stainless Steel. Catalytic Converter Substrate...
      Reduces harmful emissionsIncreases exhaust flow compared to original factory converter
      $398.76
    • (0 reviews)
      # 57879890
      Subaru WRX 2004, OEM Grade Catalytic Converter by MagnaFlow®. Catalytic Series: OEM Grade. Converter Configuration: Universal Fit. Converter Body Material: Stainless Steel. Catalytic Converter Substrate Material: Ceramic. Outlet...
      Reduces harmful emissionsIncreases exhaust flow compared to original factory converter
      $119.49 - $122.43
    • (0 reviews)
      # 61590407
      Subaru WRX 2004, Standard Catalytic Converter by MagnaFlow®. Catalytic Series: Standard. Converter Configuration: Direct Fit. Converter Body Material: Stainless Steel. Catalytic Converter Substrate Material: Ceramic. Catalytic...
      Converter body manufactured from heavy-duty stainless steelIncreases exhaust flow compared to original factory converter
      $320.31 - $485.43
    • (1 review)
      # 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 repair,...
      $47.97
    • (1 review)
      # 257003458
      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...
      $47.97
    • (0 reviews)
      # 210570867
      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
      $89.48 - $113.32
    • (0 reviews)
      # 210490254
      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
      $57.23
    • (0 reviews)
      # 155251375
      Subaru WRX / WRX STI 2.0L 2004, Vapor Canister Purge Valve by Dorman®. Dorman’s Vapor Canister Purge Valve restores on-board diagnosis of the EVAP system. Plus, its high quality metal and plastic construction keeps the system...
      Mounting hardware included (where applicable)O-ring included (where applicable)
      $88.10
    • (0 reviews)
      # 257003450
      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 your...
      $136.75 - $185.52
    • (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
      $396.00
    • (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
      $10.10 - $47.71
    • (0 reviews)
      # 210490273
      Subaru WRX / WRX STI 2004, Intermotor™ Computer Control Relay by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $21.40
    • (0 reviews)
      # 261553014
      Universal No-Weld Oxygen Sensor Mount by AEM®. This component enables an oxygen sensor to be mounted in the exhaust without having to weld a sensor bung onto the pipe. A hole is drilled in the exhaust and then the graphite gasket...
      Enables an O2 sensor to be installed in the exhaust without weldingRequires only a drill and hand tools for installation
      $39.25
    • (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...
      Kit allows Air/Separators to work at greater efficiency at all rpm levelsEnables full filtration of Blow By gases entering turbo inlet
      $117.75
    • (0 reviews)
      # mpn2059757184
      Universal Clamp On Dry Sump Breather Tank by JOES Racing®. Size: 1"-1/2". JOES Dry Sump Breather tank is designed to allow venting of your dry sump tank while catching any oil that blows out. It’s a compact 3" x 3" x 6.5" to fit...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $89.83
    • (0 reviews)
      # 252880323
      Universal Ultra™ Catalytic Converter by Walker®. Catalytic Series: Ultra™. Converter Configuration: Universal Fit. Converter Body Material: Stainless Steel. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter...
      High precious metal load and high technology washcoat for premium performanceStainless steel body and aluminized body and pipe heat shields for durability
      $113.18 - $119.90
    • (0 reviews)
      # 252880373
      Universal Catalytic Converter by Walker®. Converter Configuration: Universal Fit. Converter Body Material: Stainless Steel. Catalytic Converter Substrate Material: Ceramic. Connection Type: Pipe. With 1 Inlet. This part features...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $62.09 - $111.68
    • (1 review)
      # 139379692
      Universal Bullet Cat™ ECO III Catalytic Converter by Eastern®. Catalytic Series: Bullet Cat™ ECO III. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape:...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $82.05 - $100.28
    • (1 review)
      # 252879985
      Universal Bullet Cat™ ECO II Catalytic Converter by Eastern®. Catalytic Series: Bullet Cat™ ECO II. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape: Round....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $66.16 - $80.86
    • (0 reviews)
      # 139379691
      Universal ECO GM Catalytic Converter by Eastern®. Catalytic Series: ECO GM. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape: Large Round. Catalytic Converter...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $83.88 - $88.78
    • (0 reviews)
      # mpn1233537
      Universal ECO III Stuffed Tube Catalytic Converter with EndCap by Eastern®. Catalytic Series: ECO III. Catalytic Style: Stuffed Tube. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $81.01
    • (0 reviews)
      # 139371692
      Universal QuieCat™ ECO III Resonated Catalytic Converter by Eastern®. Catalytic Series: QuieCat™ ECO III. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape:...
      Baffled tube reduces sound levels by 35% without losing horsepowerHigh flow design retains maximum engine output and maximizes catalytic efficiency
      $105.58 - $109.69
    • (0 reviews)
      # 252880187
      Universal QuieCat™ ECO II Resonated Catalytic Converter by Eastern®. Catalytic Series: QuieCat™ ECO II. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape:...
      Baffled tube reduces sound levels by 35% without losing horsepowerHigh flow design retains maximum engine output and maximizes catalytic efficiency
      $85.15 - $88.45
    • (0 reviews)
      # 252880193
      Universal QuieCat™ Standard Resonated Catalytic Converter by Eastern®. Catalytic Series: QuieCat™ Standard. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body...
      Baffled tube reduces sound levels by 35% without losing horsepowerHigh flow design retains maximum engine output and maximizes catalytic efficiency
      $61.60 - $64.87
    • (0 reviews)
      # 252880236
      Universal Standard Stuffed Tube Catalytic Converter with EndCap by Eastern®. Catalytic Series: Standard. Catalytic Style: Stuffed Tube. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $49.63 - $50.60
    • (0 reviews)
      # 139371691
      Universal Catalytic Converter by Eastern®. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape: Large Oval. Keep your exhaust emissions within specifications and...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $70.86 - $143.46
    • (0 reviews)
      # 252880088
      Universal Catalytic Converter by Eastern®. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape: Large Round. Catalytic Converter Overall Length: 16". With 1 O2...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $69.40 - $89.96
    • (0 reviews)
      # 139371686
      Universal Catalytic Converter by Eastern®. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape: Oval. Keep your exhaust emissions within specifications and your...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $45.48 - $108.03
    • (0 reviews)
      # 139371684
      Universal Catalytic Converter by Eastern®. Converter Configuration: Universal Fit. Catalytic Converter Substrate Material: Ceramic. Catalytic Converter Body Shape: Round. Keep your exhaust emissions within specifications and your...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $42.50 - $89.96
    • (0 reviews)
      # 252888782
      Universal Catalytic Converter by AP Exhaust®. Converter Configuration: Universal Fit. Three-Way No / Air OBDII By Design US-EPA Compliant catalytic converters are efficient at the oxidation of HC’s and CO, and very efficient at...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $48.90 - $321.23
    • (0 reviews)
      # 174563966
      Universal Catalytic Converter by Bosal®. Converter Configuration: Universal Fit. 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...
      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
      $66.18 - $122.40
    • (0 reviews)
      # 182090567
      Universal Catalytic Converter by Bosal®. Converter Configuration: Universal Fit. 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...
      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
      $53.39 - $112.81
    • (0 reviews)
      # 142788929
      Universal Catalytic Converter by Davico®. Converter Configuration: Universal Fit. This Universal fit catalytic converter by Davico will be a great solution to replace your failed or damaged catalytic converter. Once your stock cat...
      Helps your vehicle emit harmless gasesDirect OEM replacement
      $72.17 - $199.50




    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.
      August 18, 2014
    • 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.
      August 10, 2014

    Popular Products

    2004 Subaru WRX Emission Control Reviews

    Average rating:  4.5  4.5 - 2 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) / November 3, 2015
    Was this review helpful for you? Yes
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    2004 Subaru WRX Models
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