GrimmSpeed Catted Downpipe 2008-2014 WRX / 2008-2021 STI
Not CARB legal: Not for sale or street use in CA & CARB states
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. The catalytic convertor that we've selected is custom sized and utilizes a metallic substrate for increased effectiveness, higher flow and better durability than other, lesser units. We selected a 300 cell count mantel for a perfect compromise of performance and function.
- Proudly made in the USA - Design, Materials and Fabrication
- Innovative 3-D Contour Flange (Limited models only)
- FARO™ Arm Designed - We are at the leading edge of new product design hardware
- Flanges Fully CNC Machined (Limited models only)
- 2 x 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!
- 1 x GrimmSpeed Catted Downpipe
- 1 x GrimmSpeed Downpipe to Turbo Gasket 028001
- 1 x GrimmSpeed Downpipe to Midpipe Gasket 022001
- 1 Set of New Bolts, Washers and Nuts for Downpipe to Midpipe
- 1 x O2 bung Threaded Cap (to be used if no wideband sensor is installed)