Grimmspeed Catted Downpipe

2015-2021 STI

Ships for free in the 48 states

SKU: 007091

Out of Stock

Increase your exhaust flow with a Grimmspeed Catted Downpipe for your Subaru STI.

Note: Not Legal for sale or use in California on any emission-controlled vehicle.


GrimmSpeed Catted Downpipe Highlights

  • Made in the USA
  • 3” Tubing
  • High Flow 300 cell Cat
  • Divorced Wastegate For Increased Flow
  • Gaskets Included
  • O2 Bungs for OEM Sensors and Wideband
  • 304L Stainless Steel Tubing

Catted Downpipe

GrimmSpeed knows how important efficient exhaust flow is, and designed their catted downpipe to improve just that. GrimmSpeed uses 3D scans of multiple OEM downpipes to account for any variances within stock parts, and perfect the fitment on theirs. The tig welded downpipe starts with CNC’d mandrel bent 16ga 304L stainless steel tubing and 1/2 “ flanges to ensure durability. The divorced wastegate was located with CFD simulations to confirm optimal flow is achieved. It is then reintroduced to the exhaust flow before flowing through the custom sized 300 cell cat.

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