Note: In order to remain CARB compliant, this product cannot be shipped to California.
A downpipe is one of the first modifications that should be done on your car, as the OEM downpipe contains two very restrictive catalytic converters. Replacing these with our single high-flow unit will dramatically improve performance potential while maintaining the use of a catalytic converter. Within our complete lineup of downpipes, you have the option to add a high-flow, 300 cell catalytic converter, fully machined and contoured flanges with beautiful brushed tubes and black ceramic coating. Whether you're racing time attack or to work and back, we've got the perfect downpipe for you.
Proudly made in the USA - Design, Materials and Fabrication
FARO Arm Designed - We are at the leading edge of new product design hardware
O2 Bungs for factory sensor and aftermarket wideband AFR
Divorced Wastegate for Optimal flow
High-flow, 300 cell, metallic substrate catalytic converter
GrimmSpeed Gaskets Included - A $40 Value!
Note: Once you have added our downpipe to your vehicle, you must be tuned. Replacing your factory catalytic converter sometimes causes a 'cat converter efficiency' check engine light. You can either use tuning to delete this CEL or you can use a mechanical fix. GrimmSpeed aftermarket downpipes modify OEM emissions control devices and are intended only for off-road racing applications.
Fitment: Fits 2002-2007 WRX, 2004-2007 STi, & 2004-2008 FXT