SoloRacer

I have a 1989 951 with a bursche cat bypass and stock exhaust. My car has a nice low rumble to it when idling around town but my friends (whom I have passed on the highway several times) tell me that when I am under boost my exhaust loses some of it's rumble and gets loud and tinny sounding. Inside the car everything sounds good and I don't notice any tinny noise. Could this be the result of the cat bypass? Would a different exhaust/muffler fix this buzzy/tinny sound? From what my friends describe I almost thought I had a broken baffle in the muffler.

Toolmaster

Soloracer -

check the gaskets on the wastegate... They might be leaking after the gate into the test pipe.

HTH!'

emilysgranny

Check the tin heat shield over the area where the cat is /was, the brackets have a habit of breaking.