GrimmSpeed LIMITED Downpipe Divorced Ceramic Coated Catted

2008-2014 WRX / 2008-2021 STI / 2005-2009 Legacy / Outback XT (Manual Tans Only)

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

LIMITED Downpipe Specs:

  • Black ceramic coated option
  • The ceramic coat will contain the heat generated by the turbocharger
  • 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 Ceramic Coated Catted Divorced Downpipe

The downpipe is one of the most effective and power-producing exhaust modification 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. Additionally, this will have a black ceramic finish to help reduce the engine bay temperatures and to protect surrounding components from radiant heat.  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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