1 Unlike many cars, including vintage Mustangs, installing an exhaust system on a late-model Mustang is a made-to-fit procedure. It's mainly a bolt-on affair with no welding required. Of course, having the car on a hoist makes the job much easier. The task can be done on jackstands, but as with any undercar project, having a lift helps. We begin by disconnecting the battery, coating the nuts and bolts with spray lubricant, and unbolting the stock H-pipe from the mufflers. Be sure to remove the oxygen sensors from the H-pipe with a 22mm wrench.