Cosworth High Flow Synthetic Air Filter

Part #: COS1 20002278
( 26 reviews )



Free Shipping

Free Shipping offer applies to orders over $200.00 to the 48 states via UPS Ground or USPS Priority.
Offer Excludes shipments to Alaska, Hawaii and Military Boxes. Items that are too large to ship via UPS or USPS are excluded from this offer.
Please read more on our full shipping policy HERE

Out of Stock
Orders placed today should ship by 12/09/2015



Brand: Cosworth
Filter Color: Blue
Filter Element Type: Dry
Filter Material: Synthetic
Filter Reusable: No
Mfgr. Warranty: 1 year limited warranty
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.


Subaru Impreza
WRX STI Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX STI Special Edition Hatchback 2010WRX STI Limited Sedan 2011, 2012, 2013, 2014WRX STI Limited Hatchback 2011, 2012, 2013, 2014WRX STI Sedan 2011, 2012, 2013, 2014WRX Sedan 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Premium Sedan 2010, 2011, 2012, 2013, 2014WRX Premium Hatchback 2010, 2011, 2012, 2013, 2014WRX Limited Sedan 2010, 2011, 2012, 2013, 2014WRX Limited Hatchback 2010, 2011, 2012, 2013, 2014Outback Sport 2008, 2009, 20102.5 GT Sedan 2009, 20102.5 GT Hatchback 2009, 20102.5i Sedan 2008, 2009, 2010, 20112.5i Hatchback 2008, 2009, 2010, 20112.5i Premium Sedan 2010, 20112.5i Premium Hatchback 2010, 2011
Subaru Legacy
i 2005GT Limited 2005, 2007, 2008, 2009Limited 2005GT 2005, 2006GT spec.B 2006, 2007, 2008, 20092.5i 2006, 2008, 2009, 2010, 2011, 2012, 20132.5i Limited 2007, 2008, 2009, 2012, 20132.5i Special Edition 2007, 20083.0 R Limited 2008, 20093.0 R 20093.6R 2010, 2011, 2012, 20132.5GT 2010, 2011, 20122.5i Premium 2012, 20133.6R Limited 2012, 20133.6R Premium 2012
Subaru Forester
XT 2009X 2009, 2010, 2011, 2012X Limited 2009, 2010, 2011, 2012X Premium 2009, 2010, 2011, 2012XT Limited 2009, 2010XT Premium 2010, 2011, 2012, 2013X Touring 2011, 2012XT Touring 2011, 2012, 2013
Subaru Outback
i 2005XT 2005, 2006Limited 2005XT Limited 2005, 2007, 2008, 2009R 2005, 2006VDC Limited 2005R L.L. Bean Edition 2005, 2006, 2007, 20082.5i 2006, 2007, 2008, 2009, 2010, 2011R VDC Limited 20062.5i Limited 2006, 2007, 2008, 2009, 20102.5i Basic 20072.5i L.L. Bean Edition 2008Base 20082.5i Limited L.L. Bean Edition 20083.0 R Limited 20092.5i Premium 20103.6R 2010, 2011
Subaru Tribeca
Base 2006, 2007, 2008, 2009Limited 2006, 2007, 2008, 2009, 2010Premium 2010Touring 2010
Subaru WRX
Base 2015Limited 2015Premium 2015
Subaru WRX STI
Base 2015

When it comes to aftermarket performance products, Cosworth is no stranger to aftermarket car parts, or in motorsports altogether. They have been some of the founding fathers in racing, and this company was kind enough  to manufacture a drop in factory style air filter for your 2008+ Subaru WRX/STI.

Cosworth Performance Air Filters are constructed from a proprietary synthetic, non woven single layer, pleated polyester filter media that requires absolutely no oiling. These filters feature OEM like fitment, and the filter housing is inject-molded from High Impact Polystyrene which means it will breathe well. Over 98% efficiency, and 10% reduced restriction compared to OEM filters.  

This product has no user uploaded media. You can upload your photo or video of your install by posting a review.

REVIEWS ( 26 )


Verified Purchase
Perfect fit and flow
djbrianbass29693 7 months ago
This is a great replacement for the factory airbox filter. I use it on my Stage 2 '15 FXT =)
Verified Purchase
Never going back to OEM
JasonB 1 year ago
At 15k on my 2013 WRX, it was time for a new filter. As expected the old one had a bunch of random debris caked all over it. Purchased this as Cosworth is very quality stuff. Direct drop in, 5 minute job. Over the course of about 100 miles now, I've noticed an immediate improvement with MPG, average about 1.5MPG higher now, driving 4 miles to work one way. Before I would average 16.9, now I am pushing 18.6
Verified Purchase
Great filter
zack_c21043 1 year ago
This was very easy to install and improved my gas mileage by 1-2 mpg. Quality product.
Verified Purchase
09 WRX minor build
distefano.vincent62253 1 year ago
Just put in this filter in my car tonight. stock air box is PITA in my opinion but none the less is in and INSTANTLY felt a noticeable difference during start, idle, normal driving, and good pulls. It quieted the sound of the car overall at idle to almost none existent. Throttle was crisper a little bit and significantly smoother through the entire RPM range. Supremely impressed with a Drop in Filter. HIGHLY RECOMMENDED!!! ALOT of bang for your buck. Great investment! Seriously happy i bought this!
Verified Purchase
No brainer drop in
wirelessandy00142 2 years ago
I have resisted modifying my 2013 STI hatch. But after the Cobb Stage 1, I wanted something fairly easy, so I tried the Cobb short intake. Too noisy for my tastes. Maybe I'm getting older? Went back to stock and dropped in the Cosworth filter. Easy install and priced right. With the Stage 1+ tune, I'm quite happy. Noise is as close to stock as it gets.


  • AnswerQ: Filter life  charlesbuck3989131 1 year ago

    What is the mileage life of this Cosworth panel filter? Same as the OEM?

    • A: How long a filter will last depends heavily on the conditions and you can expect this to last a little longer than OEM.

      Zach G. 1 year ago

  • AnswerQ: Will this need a specific tune?  boylagz 2 years ago

    I want this filter in my 2014 WRX. Im running Cobb AP stage 1 with stock intake; will this filter require a custom tune?

    • A: We recommend tuning for any upgraded filters, especially on 2008+ models.

      Zach G. 2 years ago

  • AnswerQ: Tune?  Steelman87 2 years ago

    Just Curious If A Tune Would Be Needed With This Drop In Filter?

    • A: We recommend tuning for any upgraded filters, especially on 2008+ models.

      Zach G. 2 years ago

  • AnswerQ: This filter + Cobb AP  Mitch567 2 years ago

    13 WRX I noticed that COBB released a new OTS tune for STI's that is specific to this panel filter. However, no new tune for WRX's. Would you recommend using this filter with the OTS stage 1 (stock airbox) tune?

    • A: With any panel filter I would recommend a stock airbox tune. It would not be to factory specs but it should not be off to the point of causing an issue.

      Nick S. 2 years ago

  • AnswerQ: Freebie  dumschmuck 4 years ago

    When I purchase this filter, will it come with a free Cosworth sticker? How many miles do you think this should last me before changing?

    • A: This filter does not include a Cosworth sticker. There are many variables to determine filter life, but this will definitely last longer than the OEM air filter.

      Zach G. 4 years ago