i have a 99 ls1 trans am with some kind of exhaust leak, ive replaced the manifold gasket like 5 times, and it isnt leakin there is some kind of air blowing down between the 3rd and 4th coil on the drivers side, so if anyone has any idea what it could be id extremly appriciate it. thanks.

 

if theres air blowing could be you AIR pipe has a leak or hole in it. check that first, if not try the gasket between headers and cat, if theres a leak there could feel like air is coming up by the coil

 

i never thought about the air pipe im gunna check that cuz thats the only thing i havnt so far. thanks.