It took 3 hours to install, nothing would line up, pipes were bent. Once installed the passenger side O2 sensor kept hitting the bellhousing. Removed and was going to weld on a new boss and relocate O2 out of the way, but the pipe is bent wrong and will not seal to exhaust manifold. The weld on the "H" part was incomplete and leaking, had to weld. MAC used to make a nice and economical part, but this is a piece of junk!