98-2000 already have welded 4 into 1 stainless header factory installed?
by Geert
I've briefly looked at a 97 exhaust and 99 exhaust and the 97 appeared to be cast iron, while the 99 (would be same for 98 and 00) appears to be a welded 4 into 1 stainless steel header (about as good as you could ever get) factory installed. I think the redesigned exhaust on the 98 on up was part of the effort to get an additional 9? HP out of the existing engine. The 97 and 99 also have some other differences such as the precatalytic converter location, so I don't know how easy it would be to swap the two, or how much benefit you would get, if any. It wouldn't be a noticeable difference I don't think, unless you were adding a turbo or supercharger and were redoing the entire engine and exhaust.