Originally Posted by robert_barnes181

had two michanics listen to it the cant figure it out because it goes away when reved or after its warmed up they drive till it goes i think it maybee exhaust i pulled off h pipe and replaced gasket also welded up cross piece instead of clamp and it sounds way better i just never heard exhaust sound that way

Originally Posted by Mustang_NTriangle

does it only do this when car is cold and goes away. If so, does your motor had forged pistons as noise could be clanging of pistons perhaps...

Originally Posted by robert_barnes181

im talking about gasket on pass side at the manifold