2004 Subaru WRX Emission Control Parts
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Holstein®EGR ValveSubaru WRX 2004, EGR Valve by Holstein®. Global coverage of European, Asian, and Domestic vehicles. OE Replacement Parts You Can Trust. The Variable Valve Timing Solenoid alters the supply of oil pressure to the camshaft depending on...Holstein focuses on using only the highest quality materialsManufactured to exacting standards for an aftermarket product that is truly built to match or exceed the OE part$117.99 - ReplacementOxygen SensorSubaru WRX 2004, Oxygen Sensor by Replacement. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by Replacement will last a...Expertly crafted from premium materialsDesigned to match rigorous quality standards$10.82 - $25.02
- ACDelco®Professional™ Oxygen SensorSubaru WRX 2004, Professional™ Oxygen Sensor by ACDelco®. Position: Downstream. If your O2 Sensor is not functioning properly, you are robbing yourself of performance and costing yourself money at the gas pump. Let ACDelco’s...ACDelco Professional Oxygen Sensors earn the name ACDelco by being put through a variety of tests, often under extreme and unusual conditionsCustomers can receive better gas mileage with a properly working oxygen sensor$87.99
- CRS®Air Fuel Ratio SensorSubaru WRX / WRX STI 2.0L 2004, Air Fuel Ratio Sensor by CRS®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Compliant with the most strict standards for qualityDesigned to comply with the highest quality standards$39.82 - $92.91
- Luber-finer®PCV ValveSubaru WRX / WRX STI 2004, PCV Valve by Luber-finer®. PCV valves are designed to precisely return crankcase combustion gases to the air intake system. Overextending the part’s service promotes sludge formation, which clogs the...Designed to deliver optimum performanceRight for your vehicle and lifestyle$4.36
- GPD®Exhaust Gas Temperature (EGT) SensorSubaru WRX / WRX STI 2.0L 2004, Exhaust Gas Temperature (EGT) Sensor by GPD®. The EGR pressure sensor works with the EGR valve to regulate the pressure of the EGR system. If pressure is low, the EGR valve will increase flow and vice versa.Designed to meet/exceed OE fit, form and function100% Tested for durability and performance$38.23
- NTK®Air Fuel Ratio SensorSubaru WRX 2004, Air Fuel Ratio Sensor by NTK®. Position: Upstream. Location: B1S1. 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...Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement$133.20 - $189.09
- CATCO®Direct Fit Catalytic Converter and Pipe AssemblySubaru WRX STI 2.5L with California Emission / Federal Emission 2004, Catalytic Converter and Pipe Assembly by CATCO®. Converter Configuration: Direct Fit. Designed and manufactured with innovative fabrication methods, high-tech...$312.72 - $533.02
- Eastern Catalytic®ECO II Direct Fit Pre-Cat Catalytic ConverterSubaru WRX STI 2.5L 2004, ECO II Pre-Cat Catalytic Converter by Eastern Catalytic®. Converter Configuration: Direct Fit. Position: Front. Location: Undercar. Without O2 Sensor Port. Catalytic Converter Overall Length: 24.5". If you need...$531.08
- BRExhaust®Direct Fit Catalytic ConverterSubaru WRX with Federal Emission 2004, Catalytic Converter by BRExhaust®. Converter Configuration: Direct Fit. Position: Center. If you’re in need of a replacement catalytic converter, you can’t do better than BRExhaust. They’re a...$584.83
- ACAT Global®High Performance Universal Fit Catalytic ConverterSubaru WRX Base 2004, High Performance Catalytic Converter by ACAT Global®. Converter Configuration: Universal Fit. Position: Front. Without O2 Sensor Port. Catalytic Inlet Diameter: 2.5". Catalytic Outlet Diameter: 2.5". Catalytic...$171.50
- ACAT Global®Universal Fit Catalytic ConverterSubaru WRX Base 2004, Catalytic Converter by ACAT Global®. Converter Configuration: Universal Fit. Position: Front. Without O2 Sensor Port. Catalytic Inlet Diameter: 2.5". Catalytic Outlet Diameter: 2.5". This product features the...$218.95
- DEC®Direct Fit Catalytic Converter and Pipe AssemblySubaru WRX / WRX STI Base 2.0L 2004, Catalytic Converter and Pipe Assembly by DEC®. Converter Configuration: Direct Fit. Position: Rear. With O2 Sensor Port. Pick out a catalytic converter by DEC and get your emissions back into check...$257.75
- TruParts®Direct Fit Catalytic Converter and Pipe AssemblySubaru WRX / WRX STI 2.0L with California Emission 2004, Catalytic Converter and Pipe Assembly by TruParts®. Converter Configuration: Direct Fit. Position: Front. Go with this high-quality product to restore your vehicle’s lost power...$176.10
- Edelbrock®Victor Series PCV Valve Cover BreatherVictor Series PCV Valve Cover Breather by Edelbrock®. These push-in style valve cover breathers contain a foam filter element which allows the engine to properly breathe and traps oil vapor and prevents engine compartment contamination....Made with precision and quality in mindDesigned to meet your specific needs$39.95 - $53.95
- Edelbrock®Victor Series Race Style PCV BreatherVictor Series Race Style PCV Breather by Edelbrock®. Designed utilizing the latest technology, this product by Edelbrock features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$44.95
- GReddy®S-Type Breather Tank Replacement Seal CapS-Type Breather Tank Replacement Seal Cap by GReddy®. Designed originally for racing engines, today’s compact production engines can also benefit from the used of Breather Tank Replacement Seal Cap.Designed to deliver trouble-free, consistent performanceRight for your vehicle and racing lifestyle$9.50
- Peterson Fluid Systems®Vacuum RegulatorVacuum Regulator by Peterson Fluid Systems®. 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 extensive testing. Vacuum can be...All Aluminum construction for light weightCNC Machined$244.18
- Black Forest Industries®Secondary Air Injection Block Off PlateSecondary Air Injection Block Off Plate by Black Forest Industries®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind....Eliminate clutter with these machined aluminum platesAn OEM metal gasket is included for proper sealing as well as stainless headcap hardware for a complete bolt on installation$32.99
- Walker®Ultra™ Universal Fit Large Oval Body Catalytic ConverterUniversal Ultra™ Catalytic Converter by Walker®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Oval. Without Air Tube. With O2 Sensor Port. Catalytic Converter Overall Length: 18". The Right converter,...$122.73 - $157.97
- iD Select®ECO GM Universal Fit Large Round Body Catalytic ConverterUniversal ECO GM Catalytic Converter by iD Select®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. With 1 O2 Sensor Port. Catalytic Converter Overall Length: 16". Swap out your worn-out or...$197.39
- AP Exhaust®Super X Duty Universal Fit Large Oval Body Catalytic ConverterUniversal Super X Duty Catalytic Converter by AP Exhaust®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Oval. Without Air Tube. With 1 Center O2 Sensor Port. Catalytic Converter Overall Length: 17"....$214.23
- Eastern Catalytic®ECO GM II Universal Fit Large Round Body Catalytic ConverterUniversal ECO GM II Catalytic Converter by Eastern Catalytic®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. With 1 Angled O2 Sensor Port. Catalytic Converter Overall Length: 16". Whether your...$248.92
- Eastern Catalytic®ECO GM Universal Fit Large Round Body Catalytic ConverterUniversal ECO GM Catalytic Converter by Eastern Catalytic®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. Catalytic Converter Overall Length: 16". Whether your catalytic converter is damaged by...$248.27 - $248.92
- Eastern Catalytic®ECO II Universal Fit Large Round Body Catalytic ConverterUniversal ECO II Catalytic Converter by Eastern Catalytic®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. With 1 O2 Sensor Port. Catalytic Converter Overall Length: 16". Whether your catalytic...$145.33 - $173.20
- ACAT Global®High Performance Universal Fit Catalytic ConverterUniversal High Performance Catalytic Converter by ACAT Global®. Converter Configuration: Universal Fit. This product features the elaborate design that was engineered with superior precision and refined to the last detail. Made from...$138.95 - $259.95
- ACAT Global®Universal Fit Catalytic ConverterUniversal Catalytic Converter by ACAT Global®. Converter Configuration: Universal Fit. This product features the elaborate design that was engineered with superior precision and refined to the last detail. Made from reliable materials...$121.66 - $231.95
- Facet®Oxygen SensorSubaru WRX / WRX STI 2004, Oxygen Sensor by Facet®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in mind. It will meet your...The reliable goods for increase of reliability of the carQuality equal, if not superior, to that of the original components$114.54
- Herko®Oxygen SensorSubaru WRX STI 2.5L 2004, Oxygen Sensor by Herko®. Designed as a direct-fit replacement of your worn-out or malfunctioning part, it will provide easy, no-hassle installation and help restore proper fuel system functionality needed to...Will help optimize your vehicle’s performance and fuel efficiencyBuilt using high-grade materials for ultimate quality and durability$51.03
- Autotecnica®PCV Valve Hose KitSubaru WRX / WRX STI 2.0L 2004, PCV Valve Hose Kit by Autotecnica®. This superior part by Autotecnica is a great alternative solution to the costly factory equipment that will help you restore smooth and efficient operation of your...Designed to replace your worn out factory emission partOptimizes engine cooling performance$27.43
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