what he said but wear safety glasses as the exhaust will blow the shavings back at you.i used this method on my idi,worked great except the metal in the eyes
will the clamp on style work on the manifold?
i have the threaded one to just looks like it would be hard to get a t handle pipe threader down there
Use a ratchet an extension and a square socket that will fit the tap, and tape the tap to the square socket