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205 Posts
I did some reading last night a lot of reading and dellisoh is right but so are you bex, simply put headers and straight pipe for race cars only, because you are right in needing the cat and muffler, but it also depends on how it is made as well, straight through mufflers yeild the best HP increase but they need to ne made right with no obstructions through the muffler like the average glass pack is made, and yes you do need back pressure but only 2 to 6 psi to produce the scavaging effect, man it helps to read sometimes, I just now need to know if cat and muffler placement make a difference