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Originally Posted by JL8Jeff
If you have an aftermarket cat that is a true 3" inlet/outlet, then it's not costing you any real power at all(maybe 2-3 hp). The stock cat-back and muffler will cost 10-15 hp easily since it necks down to 2-1/2". But if you have an aftermarket cat-back then it's probably a real 3" cat-back and not costing much power at all.
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i've read dozens of articles (taken with a grain of salt, natch) regarding a true 3" straight back, including catalytic converter and muffler.
power was actually lost by leaving out components than by having the whole system connected correctly, OEM style. now, that's 3" all the way back (for the short bus people) from the header collector to the tailpipe, with no bottlenecks at all (all of the components were 3" in, 3" out, all pipe 3" OD). of course, if you are going to run true dual, then you'll need two cats and two mufflers.
LT1s are no different. this applies to all chevy small blocks. now, collector length is another story...