Add Performance and Protection to Your Subaru Impreza WRX STi

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The Subaru Impreza WRX STi is a performance compact car whose origin was derived from the STI (Subaru Tecnica International) division of Subaru.
Subaru Impreza WRX STi
Subaru Impreza WRX STi
Subaru's STI division was created for the development of high-performance sport compact cars that could withstand the rigorous demand of the motorsports industry. The all-wheel drive, turbocharged Subaru Impreza WRX STi is a fun and adventurous performance car that has been manufactured for the everyday consumer since 1992.
Lifetime Air Filter for 2007 to 2009 Subaru Impreza WRX STi 2.0L and 2008 and 2009 Subaru Impreza WRX STi 2.5L
Lifetime Air Filter for Subaru Impreza WRX STi


High-flow air filters, cold air intake systems and performance oil filters are available from K&N for added performance and protection of your Subaru Impreza WRX STi.

K&N has over 40 years of experience developing high-flow replacement air filters. Our replacement air filters for the Subaru Impreza WRX STi are designed to increase horsepower and acceleration while providing excellent filtration to protect your engine. K&N replacement air filters are washable, reusable and backed by the K&N Million Mile Limited Warranty. It will be the last air filter you will ever need.

The 33-2304 is a replacement air filter that was designed to fit directly into your stock airbox. This simple drop-in design makes it an easy performance add-on. This filter will fit the following Subaru Impreza WRX STi models:

2009 Subaru Impreza WRX STi with the 2.5 liter engine
2008 Subaru Impreza WRX STi with the 2.5 liter engine
2009 Subaru Impreza WRX STi with the 2.0 liter engine
2008 Subaru Impreza WRX STi with the 2.0 liter engine
2007 Subaru Impreza WRX STi with the 2.0 liter engine
Replacement Air Filter for 2004 to 2007 Subaru Impreza WRX STi models that have the  2.5 liter engine
Replacement Air Filter for Subaru Impreza WRX STi

Replacement Air Filter for 2003, 2004 and 2005 Subaru Impreza WRX STi with the 2.0 liter eninge
Subaru Impreza WRX STi Replacement Air Filter


2004 to 2007 Subaru Impreza WRX STi models that have the 2.5 liter engine and the 2002 Subaru Impreza WRX STi model with a 2.0 liter engine use K&N's 33-2232 for a lifetime of performance and protection.

Owners of 2003, 2004 and 2005 Subaru Impreza WRX STi models equipped with a 2.0 liter engine can get the most from K&N's 33-2154 drop-in performance air filter.
Performance Air Intake for Subaru Impreza  WRX STi
Performance Air Intake for
Subaru Impreza WRX STi


Performance Air Intake for Subaru Impreza  WRX STi
Subaru Impreza WRX STi
Performance Air Intake


K&N performance air intakes for the Subaru Impreza WRX STi will increase horsepower, guaranteed. We replace the factory air filter, air box and intake assembly with a K&N oversized high-flow conical air filter and intake tube. Our high performance air intakes are designed to allow virtually unrestricted air flow into your engine while filtering it of harmful contaminants.

The air intake systems 69-8001TS and 69-8001TWR are guaranteed to provide more horsepower and increased acceleration. The 69-8001TS was engineered with a high quality powder coated silver finish while the 69-8001TWR uses a stylish powder coated wrinkle red finish. Testing has shown that the 69-8001TS and 69-8001TWR have a gain of 15.85 more horsepower @ 5050 RPM. These intakes fit the following Subaru Impreza WRX STi models:

2007 Subaru Impreza WRX STi with the 2.5 liter engine
2006 Subaru Impreza WRX STi with the 2.5 liter engine
2005 Subaru Impreza WRX STi with the 2.5 liter engine
2004 Subaru Impreza WRX STi with the 2.5 liter engine
2007 Subaru Impreza WRX STi with the 2.0 liter engine
2006 Subaru Impreza WRX STi with the 2.0 liter engine
2005 Subaru Impreza WRX STi with the 2.0 liter engine
2004 Subaru Impreza WRX STi with the 2.0 liter engine
2003 Subaru Impreza WRX STi with the 2.0 liter engine
2002 Subaru Impreza WRX STi with the 2.0 liter engine
Premium Oil Filter for Subaru Impreza  WRX STi
Premium Oil Filter for Subaru Impreza WRX STi


K&N premium oil filters for your Subaru Impreza WRX STi protect your motor from harmful contaminants while allowing for high oil flow rates. Our canister oil filters are protected by heavy-duty canister walls which provide extra strength and durability to reduce the risk of damage from loose rocks and debris. They also have a one inch nut on top for easy wrench-off removal. They deliver outstanding filtration to keeping your Impreza WRX STi running clean and smooth.

2004 to 2007 Subaru Impreza WRX STi models with a 2.5 liter engine as well as 2004 and 2005 Subaru Impreza WRX STi models with a 2.0 liter engine use K&N's HP-1008 oil filter. The HP-1008, like all K&N oil filters, comes with a limited warranty to be free from defects in materials and workmanship.


K&N has manufactured a variety of performance parts for the Subaru Impreza WRX STi.  To find other K&N products for your Subaru Impreza WRX STi or any other vehicle use the K&N application search on KNFilters.com.



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K&N Engineering, Inc., with headquarters in Riverside, California, has been the world's leader in performance filter technology since 1969, serving the needs of the automotive, motorcycle, marine, industrial and military markets. K&N is heavily involved in nearly every form of motorsports from off-road and powersports to drag racing, stock cars and road racing. For more information about K&N Filters, please contact K&N Engineering, Inc., P.O. Box 1329, Riverside, CA 92502-1329, (800) 213-4182 for a dealer near you, (800) 858-3333 for technical service/questions, (951) 826-4001 Fax, e-mail tech@knfilters.com, or visit www.knfilters.com.

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