Quote:
Originally Posted by ninjaryda
The purpose of a header, is to scavenge the cylinder. That's why you loose a little bottom end but gain on top end; the scavenging effect helps empty the cylinder at higher RPMs (and indirectly fill it faster with intake because of the value overlap), but drains it too quickly at lower RPMs. That's why you usually have modified cam and intake to go along with it, as opposed to using stock setup (which isn't setup for that). But the way this engine makes its power band, I doubt anyone notices the loss in the lower RPMs. But yeah, aluminum doesn't sound like it would make a good header (you don't really need to get rid of the heat on the headers, because that's what helps make the scavenging effect, along with free flowing exhaust).
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I was thinking the wrap might counteract that, but I hadn't really thought about loss in flow due to lack of heat. I should've though, I just wrapped my headers to help with that..