560 SEL. After my exhaust dropped again I figured it will soon be time to replace the whole thing. Shop will do from manifold on back. With the cat gone, I should free up some HP.

Question is what size pipe would be a good fit. Stock looks 2 or 2.25". I know that some think back pressure is a myth and some say its needed. I am NOT looking for loud exhaust. In fact I want it to be as quiet as possible, even more so than stock if possible. Shop can even do double-walled. But I dont think I will go that far.

So if you wanted good flowing but very quiet exhaust, what setup would you build? And with the cat gone, will anything involving engine management have to be tweaked?

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car