@qwertyq – Good point about the bolts. As an example, if a performance exhaust manifold has been installed on the engine, it’s possible that the type of bolt suggested by the car’s manufacturer won’t work. Obviously, that isn’t a problem if SushiChamp bought their car brand new, but if it’s used, the identity of the manifold is in question. I’m sure there’s a way to tell one manifold apart from another, but they all look the same to me. That’s why I call in the professionals!