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So I've just learned something: Even if your mufflers say "Bischoff" on them, you might still have a Gillette system.
Is that correct?
its possible, since the only difference is the needing of the doughnuts or not. Porsche didn't build every cat pipe the same, but more importantly the muffs are the same (technically). If you'll notice the picture that Mark so graciously altered the muff ends are the same. We build the doughnut into the pipe that way it doesn't matter what you have, our stuff will work not matter.