Exhaust leaks are a common headache on modded Subarus, often appearing unexpectedly and causing hours of troubleshooting. One of the most frequent culprits? Running an OEM downpipe with an aftermarket 3″ catback without a proper adapter. GrimmSpeeds 3″ Downpipe Adapter provides the perfect solutionallowing you to reuse your stock donut gasket for a reliable, leak-free connection.
Quick Specs
- Flanged for OEM Donut Gasket Maintains proper fit and sealing
- Machined Lip Centers 2-Bolt Gasket Ensures perfect alignment
- CNC-Machined Steel Construction Zinc coated for durability and corrosion resistance
- Simple Bolt-On Installation Includes quality hardware for easy setup
- Includes GrimmSpeed 3″ 2x Thick Gasket Provides a perfect seal every time
CNC-machined from mild steel and zinc-coated, this adapter is built to last the lifetime of your car. Dont waste time struggling to get an OEM downpipe to seal with a flat gasketreuse your stock donut gasket along with the included 2x thick GrimmSpeed 3″ gasket for a flawless, leak-free installation on the first try.

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