Magnum Exh manifold machining.

Anybody with a Bridgeport and a vise, and maybe a few clamps, can fly-cut those manifolds. I had a friend do mine (a long time ago) in his basement shop. He did not have any special fixtures... just rigged something up. You are only taking a few thousandths off with a single-point tool. All you need is something to hold onto it so it can't move.