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 adaptor. Use an adaptor 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: Adaptor is only inteded to be used for connecting an OEM Downpipe to an aftermarket Catback. We produce a different adaptor for the opposite purpose.


11 Reviews

5/5 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.

21st Apr 2017


Gets the job done, super easy too install and no leaks what so ever. However, after installing the catback, drive around 100 miles and tighten the bolts one more time to ensure a good, snug hold. Once again, excellent product!

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