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Help Your 1999-2008 Subaru Forester, Outback, Impreza, or Baja Breathe Better with a K&N Replacement

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K&N 33-2075 replacement air filter will fit all 2.0L, 2.5L, and 3.0L boxer engines that were installed in the 1999-2008 Forester, Outback, Impreza & Baja.

Most vehicles use either an inline or V-type engine, where the cylinders are positioned to move in an up-and-down fashion. A Subaru on the other hand, uses a Boxer-type engine where the cylinders lay flat and move in-and-out. The advantage of this type of layout is smooth operation, and a more compact engine that can be mounted lower in the chassis. As a result, you get more nimble handling, and a powerful engine that remains surprisingly vibration-free as the revs increase. The power then gets routed to all four wheels through the Subaru Symmetrical AWD, and you get carried down the muddy track, or over the snow bank that stands in your way. Whether you drive a Forester, Outback, Impreza, or Baja, your Subaru can definitely get you to where you're going. However, if you'd like a bit more horsepower and torque from that boxer engine, you're going to need a K&N 33-2075 replacement air filter.

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The K&N 33-2075 replacement air filter is designed to improve horsepower, torque, and throttle response.

Every internal combustion engine, including the 4 and 6-cyl Subaru boxer, makes power in the same way: gas and air are sucked into the cylinders as the piston moves inward on the "intake stroke", then the piston moves outward to compress the mixture. As the piston moves toward the head, a spark plug ignites the fuel/air mix and the resulting explosion forces the piston back in, turning the crankshaft, which then sends power to the drive wheels. If you add more air to the equation the detonation will be much hotter, which will push the piston with more force. This force is where horsepower comes from, and you can increase it by simply using a K&N 33-2075 replacement air filter.

The OE Subaru air filter is made from a thick folded paper, which reduces airflow by collecting dirt on the surface. By the time you reach the 10,000-15,000 mile mark, all of that dirt will severely restrict the amount of air that can pass through it. A K&N 33-2075 replacement air filter by contrast, is made from multiple layers of cotton gauze. Not only does this material breathe better, it's treated with a special oil that causes the cotton fibers to become sticky and attract dirt. This design increases airflow by 50%, and is designed to increase horsepower and torque. It will also reduce engine strain, because the engine won't have to work as hard to create power.

Another benefit of using a K&N replacement air filter is that you can wash and reuse it at a recommended interval of 50,000 miles (depending on road conditions). Then you simply remove the filter from the air box and clean it using the K&N air filter cleaning kit. Thanks to the exceptional build quality, every K&N filter is backed by the K&N 10-Year/Million Mile Limited Warranty, so it's guaranteed to last as long as your Subaru. To experience the best performing and longest lasting air filter that you will ever buy, use the K&N product search tool. Or you can use the dealer locator tool to find a K&N dealer near you.

Features & Benefits of the K&N 33-2075 Replacement Air Filter

  • Designed to fit all 2.0L, 2.5L and 3.0L boxer engines in the 1999-2008 Forester, Outback, Impreza & Baja
  • Designed to increase horsepower
  • Designed to increase torque
  • High-Flow filter design offers unrestricted airflow and superior filtration
  • Will not alter ECU programming
  • Completely road legal in all 50 states
  • Reusable K&N air filters will not need to be cleaned for up to 50,000 miles (depending on road conditions)
  • Direct replacement for an OEM Subaru boxer air filter
  • Backed by the K&N 10-Year/Million Mile Limited Warranty

K&N Applications for 33-2075 Replacement Air Filter

2008 SUBARU FORESTER 2.5L H4 F/I - All
2007 SUBARU FORESTER 2.5L H4 F/I - All
2006 SUBARU FORESTER TURBO 2.5L H4 F/I - All
2006 SUBARU FORESTER 2.5L H4 F/I - Non-US, Turbo
2006 SUBARU FORESTER 2.5L H4 F/I - All
2006 SUBARU BAJA 2.5L H4 F/I - All
2005 SUBARU IMPREZA WRX 2.0L H4 F/I - US
2005 SUBARU FORESTER TURBO 2.5L H4 F/I - All
2005 SUBARU FORESTER 2.5L H4 F/I - Non-US, Turbo
2005 SUBARU FORESTER 2.5L H4 F/I - All
2005 SUBARU BAJA 2.5L H4 F/I - All
2004 SUBARU OUTBACK 3.0L H6 F/I - VDC
2004 SUBARU OUTBACK 2.5L H4 F/I - Turbo
2004 SUBARU IMPREZA WRX STI 2.5L H4 F/I - All
2004 SUBARU IMPREZA WRX 2.0L H4 F/I - US
2004 SUBARU FORESTER 2.5L H4 F/I - Turbo  
2004 SUBARU BAJA 2.5L H4 F/I - All
2003 SUBARU FORESTER 2.5L H4 F/I - Non-US, Turbo
2002 SUBARU FORESTER 2.5L H4 F/I - Non-US, Turbo
1999 SUBARU IMPREZA 2.5L H4 F/I - OEM 16546AA020


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K&N Engineering in Riverside California is the world's leading manufacturer of washable performance air filters and air intake systems. K&N invented the reusable high flow cotton air filter in 1969 and has been perfecting the technology ever since. K&N is a world class filtration company selling air filters, oil filters, and intakes in over 50 countries. K&N sells over 5,000 products designed for cars, trucks, motorcycles, engines, and industrial applications. From their Million Mile Warranty to their Consumer Protection Pledge, K&N stands behind their products and their consumers 100%. The distinctive K&N logo represents performance from one of the original performance companies. For more information, visit knfilters.com.