Grimmspeed Downpipe 3" Catted w/ Black Ceramic Coating Subaru WRX 2002-2005 | WRX STI 2004-2007 | Forester XT 2004-2008

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Grimmspeed Downpipe 3" Catted w/ Black Ceramic Coating Subaru WRX 2002-2005 | WRX STI 2004-2007 | Forester XT 2004-2008

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For those looking for power out of your Subaru EJ powered WRX or STI, the downpipe is critical. Given that all downpipes are not created equal, the Grimmspeed downpipe shines above many others on the WRX and STI. This awesome downpipe is made right here in the USA out of 304 stainless steel which is the standard for durability and strength. Although, not all 304 downpipes are the same either. Grimmspeed uses 16 gauge tubing and 1/2 inch thick flanges on both ends to make sure the integrity of this downpipe is maintained throughout the life of the downpipe. Of course, 3" piping diameter is used to reduce backpressure significantly. The wastegate flow in the factory downpipe immediately joins the flow of the exhaust coming out of the turbine which causes a lot of turbulence and interrupted exhaust flow. This isn't ideal for making power. The Grimmspeed downpipe separates the wastegate exhaust flow from the main turbine and allows it to join further downstream which allows for much more efficiency and flow. Power is made MUCH easier with a setup like this. Fitment is spot on and fits perfectly against any stock or stock framed turbo as well as any stock exhaust (adapter needed) or stock replacement exhaust. There are 3 different options available including a black ceramic coating which will retain the heat in the exhaust system creating faster velocity through the exhaust and less heat dissipation outside the pipe. The other 2 options are between catless and catted piping and the limited features. Limited features included a CNC cut flange with a 3D contouring of the wastegate area to smooth flow. Regardless of the options you choose, each downpipe will turn your turbo Subaru into a much more capable performance car.

WRX 2002-2005, STI 2004-2007, Forester XT 2004-2008;Material=304 Stainless Steel"
Piping Diameter:
3 Inch
Flange Thickness:
1/2 Inch
Welding Type:
TIG Welded
Hardware Included:
Includes hardware and gaskets
O2 Bungs:
Factory O2 Bung Included, Extra Bung Included for Wideband
High Flow Cat:
Ceramic Coating:
Grimmspeed Limited Warranty

1 Review

  • 5
    Grimmspeed downpipe

    Posted by Barrett on Nov 23rd 2023

    Love it. Easy install and really opened up exhaust