GrimmSpeed LIMITED Downpipe Divorced Catted

2008-2021 Subaru STI / 2008-2014 WRX

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SKU: 007097We price match!

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The LIMITED Catted Divorced Downpipe increases the horsepower and turbo response in the Subaru STI. 
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GrimmSpeed LIMITED Catted Divorced Downpipe

LIMITED Downpipe Specs:

  • 304 stainless steel construction
  • 1/2" thick 3D contour flanges
  • 3" piping diameter
  • 3D CAD designed to determine the contours and clearance from the firewall 
  • Divorced wastegate design for optimal flow
  • Designed with a secondary O2 bung for those adding a wideband O2 sensor
  • FARO arm design
  • Built-in high-flow 300-cell metallic substrate catalytic converter
  • Expertly TIG-welded
  • Includes new exhaust gaskets and hardware included for the installation 
  • Made in the USA


LIMITED Features:

  • Flanges designed with recesses for each tube
  • 3D contour to smoothly transition the irregular shape of your internal wastegate outlet into the divorced tube for tighter boost control



  • Tune required for optimal performance
  • You will need to slightly adjust the divider tab to fit the V40/V46 turbocharger 
  • Please contact our customer service for further assistance


GrimmSpeed LIMITED Catted Divorced Downpipe

The downpipe is one of the most effective and power-producing exhaust modifications you can perform on your Subaru WRX/STI. This is because it's the first exhaust component right off the turbo, and the OEM unit is very restrictive by design. The GrimmSpeed unit combines smooth bends and a larger piping diameter to remove as much turbulence from the exit path of the turbocharger which will add more horsepower, and more torque while reducing the turbo lag. 

This downpipe will have a divorced flange and has a built-in high-flow 300-cell metallic substrate catalytic converter. This is a direct replacement for factory downpipe, and because downpipes typically generate a substantial amount of power in the turbocharged Subaru, a proper tune will be required to maximize the power and performance. 

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  1. By kenny February 24, 2022

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