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Only the muffler section is different, titanium and louder. The center section is the same. If you buy headers most brands also replace the entire center section up to the mufflers.
thanks i know the cat-backs are titanium (i have them on my car) but i was referring to the midsection where the H or X pipes go. also do they come with H pipes or X pipes ?
The midpipes both use an H-pipe, and are interchangeable between Z06and LS1 from '00 to '04. However, the LS1 midpipe uses two small additional catalytic converters up near the exhaust manifold, and thus has more back pressure and horsepower loss than the Z06.
'98-'99 midpipes are not interchangeable with the later ones.