Lots of folks, esp. Porsche people, gut their catalytic converter, or simply substitute a straight through "test" pipe to let the engine breathe better.
Anybody with a 535i do this? Results?
Anybody making "test" pipes out there?
gut the cat/replace the cat
Lots of folks, esp. Porsche people, gut their catalytic converter, or simply substitute a straight through "test" pipe to let the engine breathe better.
Anybody with a 535i do this? Results?
Anybody making "test" pipes out there?
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