uppipe

Best definition
uppipe
This is an item apart of a car’s exhaust manifold. This piece is found on cars with Subaru boxer engines. It is appx a 1 foot exhaust pipe that is between the header and the turbo. On regular wrx’s, the uppipe has a cat within, but on the STi model, it is catless.
I just bought a used catless uppipe for $90.

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