driv300mph
Well-known member
Third cat delete! With the valve closed or factory not much is different , maybe 5% TO 10% LOUDER, BUT WITH IT OPEN...... OMG It's def louder in a good way.
Did you feel for any leaks on first startup? On my car, just before the C-clamp connecting the muffler to the pipe there's a tiny hole. Greg at GRP said this is probably to allow the pipe to flex, but I did notice air coming out of it. Not sure it's that big of a deal.
The muffler itself also has holes -- I think this contributes to a slightly airy sound. Maybe they're all for drainage to ensure no rust.