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Originally Posted by A26B
Hp gains from headers are well documented. They reduce backpressure. Cat back aftermarket exhaust systems are beneficial as well, for the same reason. Only gutting your cats will be an insignificant reduction in back pressure.
I have 415, headers, no cats & only a single, custom muffler where the resonator used to be, and no mufflers, all with a 3" system. I dynoed it both with open headers and with the described exhaust system in place. I actually lost about 7 hp with open headers.
In summary, I do believe slight back pressure may be beneficial, but you gotta get way out on the lunatic fringe before a drop in power is noticible.
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i was just looking at your z pics on here....nice! did you custom that exhaust or is it part of the body package? and one muffler? is it 2-in & 2-out or did you go down to one 3" pipe? very nice and thanks for the info on the cats. i had an 84 years ago and i hulled out the cats on it and it sounded like a $2000 exhaust system and felt like you put nos on it.i fuigered it might work on the old Z. i'v heard that
over half the backpressure is in the cats on these?
