I noticed a small exhaust leak at the y-pipe collector just before the cat on my 93 Z28 with AS&M headers. Is this hurting my performance or gas mileage? It's too cold to get under there and fix it right now, I gotta wait until the weather gets nicer.


Thanks

I don't see how it could cause a problem. The leak is after the O2. So the O2 is getting a correct reading. The only thing I can think of.. is if the ticking sound from the leak gets loud enough your knock sensor may pick it up as false knock.