[Stocker]

Originally Posted by kwmech

There should be a steel sleeve inside of it. Sounds like you have just the donut sitting on the bevel of the head pipe

Originally Posted by Nomadicflyer

KW Mech~ There's no shoulder on the seal, is that what you mean? I think the inside is just the same malleable band that wraps to make the seal.

I don't have a pic, but many years ago I had mine apart and there was a short (2"-3"?) section of pipe that fit snugly inside the donut. The pipe slipped up into the exhaust manifold and down into the exhaust pipe, and it held the donut in place so it couldn't move or blow out.