The Pryo's usually come with two ways to mount them. If you mount it in the drivers side exhaust manifold between 6-8 cyl's, you can either drill and tap for 1/4" NPT, then the Pyro slips in the brass threaded fitting and a nut with a ferrule seals it, or drill a 1/4" hole and the Pyro is held in the hole by a special clamp that goes around the exhaust manifold. Some turbos have a place for the Pyro on the downpipe side, the exhaust manifold is the best place to have it, close to true EGT's. Some places you have to order the mounting hardware separate.