chevelle3504speed Posted December 4, 2014 Report Share Posted December 4, 2014 Hey guys, I put a 3800 SC in my '95 Olds Cutlass Supreme fairly recently, and am running a stock '98 LTZ Lumina exhaust. How restrictive is the LTZ exhaust? I have an '03 L36 Impala, and the exhaust is noticeably larger on it than the LTZ. Thanks, Andy Quote Link to comment Share on other sites More sharing options...
rich_e777 Posted December 4, 2014 Report Share Posted December 4, 2014 Depends on the diameter really, I would think that anything at or around 2.5 inches should be ok. I do remember from years ago when I was new people were talking about custom down pipes being about 3" while running 2.5" to 2.75" exhaust seemed to be the desired setup. Don't do true duals without some sort of X-over though, someone posted a video once and the GP sounded close to death sickly. Quote Link to comment Share on other sites More sharing options...
l67ss Posted December 9, 2014 Report Share Posted December 9, 2014 both cars should have the same size exhaust....if not somewhere along the line it was swapped. stock on w-bodies is 2 1/4" id Quote Link to comment Share on other sites More sharing options...
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