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Mishimoto Subaru Exhaust Adapter 3″ Downpipe to Stock Exhaust

Mishimoto Subaru Exhaust Adapter 3″ Downpipe to Stock Exhaust


  • Allows smooth exhaust-flow transition between 3-in downpipe and stock-sized exhaust
  • Eliminates infamous exhaust leaks caused by mating different exhaust flanges
  • 304 stainless steel adapter will not rust in harsh climates
  • Installs in under 15 minutes


In stock



Don’t let a pesky exhaust leak ruin the beautiful tone from your WRX/STI exhaust. The Mishimoto Subaru Exhaust Adapter allows a smooth exhaust flow transition between your 3″ downpipe and stock sized exhaust. The engineers at Mishimoto know your Subaru was built for harsh climates, so they designed this adapter with 304 stainless steel material so it will never rust. This adapter installs in under 15 minutes and includes stainless steel hardware and a new 3″ two-bolt flange gasket, making installation simple.


  • (1) 3-inch to 2.5-inch Exhaust Adapter
  • (1) 3-inch 2-Bolt Flange Gasket
  • (2) Stainless Steel Bolts
  • Serrated Flange Nuts & Washers
  • Mishimoto Lifetime Warranty


Additional Information

Weight 1.2 lbs
Dimensions 7.6 × 7.2 × 2.2 in


  • 2002-2021 WRX
  • 2004-2021 STI
  • 2004-2013 FXT
  • 2005-2009 LGT/OBXT