Cosworth High Volume Intake Manifold

Part #: COS1 20006438
( 3 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

   Hurry, only 3 left in stock!

   In Stock: Ships the Same Day
Return Policy | Shipping



Brand: Cosworth
Finish: Raw
Installation Hardware Included: Yes
Material: Aluminum
Mfgr. Warranty: 1 year
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 2004, 2005, 2006, 2007WRX STI Limited 2007WRX 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, 2014

The Cosworth Subaru intake manifold is a great upgrade for anyone who is looking to get the most power out of their car. Featuring a cast aluminum housing, this unit is able to increase air flow in high RPM on high powered cars where the stock intake manifold is creating a restriction.

Designed specifically to work with Front mount intercoolers. This unit is ideal for anyone looking to use it as a direct replacement of the stock manifold, or use it to rotate the intake manifold for front entry intercooler piping. Electronic throttle bodies only, not designed to work with cable actuated throttle bodies.



Verified Purchase
Cosworth Bling
chuysti2007 2 years ago
Just a wonderful looking intake manifold. I made great power too, I have an 07 sti with a Perrin GTX 3076r turbo kit rotated mount.
Verified Purchase
Love my Cosi Manifold
BobbyJ 4 years ago
After making an adaptor plate for the t-body I was able to make this fit my 04STi. I love my Cosi Manifold. Looks hot and sexy. Still need to tune the car to get 100% performance out of it. Thanks Rally Sports Direct for speedy service and delivery.

Nice bit of kit.
Al 4 years ago
Have this on my 2011 STi. Manifold has a coating on it that seems to keep some of the heat out. Vaccum plate can be rotated if you are running a rotated intake manifold making running hoses a little easier. Lots of ports for your FPR, gauges, etc. My small GT3076R seems to spool a little bit later, but makes big power (470 wtq @ 4250 / 442 hp ) I think this part will help out much more when I go to a GT35 or 40 series turbo. Had too many parts change (TGV Delete, larger injectors, new/better tune) when I installed this to provide a good before/after dyno plot.


  • AnswerQ:   honeycuttnathan 2 months ago

    Will this intake man fit a 2015 sti. If not then why and what modifications would be required?

    • A: This has not been confirmed to fit 15-16 STIs yet. It might fit, but compatibility has not been tested.

      Josh P. 2 months ago

  • AnswerQ: Reverse Throttle Position  Paul Rippon 2 months ago

    Can this manifold work for a reverse throttle position setup on a 2009 STI?

    • A: This unit is ideal for anyone looking to use it as a direct replacement of the stock manifold, or use it to rotate the intake manifold for front entry intercooler piping. For more information please read the product description.

      Trevor C. 2 months ago

  • AnswerQ: I have sti 2013  kat00f76730 5 months ago

    I have Cosworth block And I upgraed my turbo gtx3076r It is the gtx3076r good for this intake manifold ?

    • A: This manifold will work well with a GTX3076R turbo, but it is most beneficial for cars over 500whp.

      Zach G. 5 months ago

  • AnswerQ: turbo  Subie05 1 year ago

    Any benefits if I use my stock turbo

    • A: It is likely that you will see a reduced spool up time as well as some slight power gains once this is installed and tuned.

      Sterling W. 1 year ago

  • AnswerQ: wrapping  SoCal_STI 1 year ago

    Would there be any forseeable gains or losses from heat wrapping or thermally coating an intake manifold? I would figure since it sits directly about the block, it would have some sort of benefit against heatsoak?

    • A: Wrapping likely wouldn't be beneficial since this is directly bolted to the tumblers which bolt to the block. Thermal spacers are likely to give you more of a performance advantage than anything else.

      Nick S. 1 year ago