Stock DP>Aftermarket 3 in. Catback Adapter - Subaru

SKU: 077046
GrimmSpeed Subaru Donut Gasket

Current stock: 0

It appears that you’re not the only one with excellent taste in premium automotive components! Unfortunately, this product is temporarily out of stock, however should become available soon. You can still place your order and be put in a queue; the item will be shipped ASAP. Please contact our customer service via email or phone (612-379-0000) with questions, or check for availability with our retailers, thanks!



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 adapter. Use an adapter that allows you to retain your stock donut gasket for the best solution to finally end that pesky leak.

  • 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)
  • Includes GrimmSpeed 3" 2x Thick Gasket
    (For a PERFECT seal!)

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 with a GrimmSpeed 2x Thick 3" Gasket (included) for a perfect seal on the first try! 

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

Fitment Note: Adapter is only intended to be used for connecting an OEM Downpipe to an aftermarket Catback. We produce a different adapter for the opposite purpose.


12 Reviews

Kevin 15th Aug 2019

Sealed up my midpipe exhaust leak

I bought the Oem to 3” catback exhaust adapter even though I thought I had tightened up the nuts and bolts to seal the oem doughnut gasket to my 3” catback exhaust in my 2011 Legacy GT. To my surprise, after installing the flange and 2x thicker 3” gasket to the oem doughnut, I got a perfect seal. My catback lines up better and no more leaks. Exhaust flow and torque is noticeable and no more exhaust leak noises under the car during startup. I think that even if you think you dont have an exhaust leak with your oem downpipe to aftermarket exhaust, get this adapter and be 100% sure. Youll be happy you did.

[email protected] 24th Sep 2017

quality adapter

The adapter is a hi quality piece. I ordered this along with a new donut gasket to mate up a stock downpipe to a 3 inch catback exhaust on my 2017 Forester xt. Perfect seal. Why bother attempting to use just a standard gasket to seal the most prone area for exhaust leaks. Do your self a favor and buy this. No regrets from me.

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