exhaust...after years of use, I know the metal either wears away either the manifold or the block, so Id have to determine if its worn away at the block or manifold then get it machined and squared up...if its the manifold its easy. Although if its the engine, I suppose the only way you can do it is take the engine out and get it machined... Honestly, other than that I don't see how it can cause engine damage
