Author Topic: GrimmSpeed Downpipe Adaptor (OEM DP to 3" Catback) - Product Release  (Read 733 times)

Offline GrimmSpeed

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Install your aftermarket catback the right way!

Exhaust leaks seem to be an all-too-common issue with most modded Subarus. They tend to spring up out of nowhere and cause hours of troubleshooting headaches. One of the most common leaks that we hear about is from running an OEM downpipe with an aftermarket 3" catback without a proper adaptor. Use an adaptor that allows you to retain your stock donut gasket for the best solution to finally end that pesky leak.

Quick Specs
  • Flanged for OEM Donut Gasket
  • Machined lip centers 2-Bolt Gasket
  • CNC Machined Steel Construction - zinc coated for durability
  • Simple bolt on installation - supplied with quality hardware

CNC machined from mild steel and zinc coated for durability and longevity, this thing will outlast your car. Don't waste your time trying to get your OEM downpipe to seal without a donut gasket. In a short amount of time, they rust and corrode and will prevent you from ever getting a good seal with a typical flat gasket. Re-use your stock donut gasket along without a GrimmSpeed 2x Thick 3" Gasket (sold separately) for a perfect seal on the first try!


Zinc coated mild steel ensures a durable part that will hold up to even the most extreme conditions.

  • 2002+ Subaru WRX
  • 2004+ Subaru STI
  • Subaru Forester XT
  • Subaru Legacy GT


A final solution to pesky problems, it's what you can expect from GrimmSpeed™

For more info or to purchase, check it out on our website here:

Offline CornOntheCobb

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  • 04 WRB STi
Re: GrimmSpeed Downpipe Adaptor (OEM DP to 3" Catback) - Product Release
« Reply #1 on: April 24, 2013, 02:55:05 PM »
Very intriguing. I kinda like it, but I probably wouldn't buy one unless a leak develops.