Grimmspeed 3″ Downpipe to Stock Cat-Back Adapter – Subaru


  • Flared Adapter Transition!
    (Creates a smooth transition from your 3″ downpipe to your OEM midpipe)
  • Flanged for OEM Donut Gasket

  • Indestructible Steel CNC Laser cut construction 

  • Simple bolt-on installation.
    (With bolts included)
  • Will Not obstruct exhaust flow like other adapters.
    (Flared end guarantees smooth exhaust flow)

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. The most guaranteed leak you will get though is if you run an aftermarket 3″ downpipe to an OEM or OEM like 2.5″ Exhaust. Compare our adapter to the competition and you will immediately see why we offer the best solution to finally end that pesky leak.

Cut from Steel and hand welded these pieces were born tough. With the ability to work with both flat style gaskets AND donut gaskets they cannot be matched. If that wasn’t enough we flared out one end to just shy of 3″ so that unlike the competitors, our adapter will not block flow! 

A Final solution to pesky problems, it’s what you can expect from GrimmSpeed™

Fitment Note: This Adapter is only intended to be used for connecting an aftermarket Downpipe to an OEM Catback. Grimmspeed offers a different adapter for the opposite setup, linked below:

Grimmspeed Stock Downpipe to 3″ Cat-Back Adapter – Subaru

3″ Gasket sold separately, linked HERE.

Donut Gasket sold separately, linked HERE.

Weight 0.54 kg
Dimensions 17.00 × 14.00 × 6.00 cm


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Models suitable for this product

Make Model Year Submodel
Make Model Year Submodel
Subaru Baja 2004 - 2006 Turbo - 2.5L Turbo AWD
Subaru Forester 2004 - 2013 2.5XT
Subaru Impreza 2002 - 2014 WRX
Subaru Impreza 2004 - 2014 WRX STi
Subaru Legacy 2005 - 2009 2.5GT
Subaru Legacy 2006 - 2009 Spec B.
Subaru Outback 2005 - 2009 2.5XT
Subaru WRX 2002 - 2020
Subaru WRX STi 2004 - 2020

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