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backpressure is a falicy<sp>. the best back pressure is no back pressure. the reason large exhausts hurt low end power is because the exhaust gases have more room in the larger diameter piping, and since cold=heavy and hot=light, when the gases cool, they "back up" the flow, hindering exhaust port scavenging.

with a turbo, larger diameter piping is ok, because the air coming from that is so friggin' hot, it will stay hot all the way out...

the best possible exhaust setup you could have is open headers. period. that's why race cars do it.

the only thing about that is, though, that you want to have more intake flow than exhaust flow, commonly, because you need to keep the intake side pressurized.

the only part about all this i'm not completely certain of is the last part, so if anyone wants to correct me, feel free...

uRiDiAN
 

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mpr: the pics

got them from discount tire direct, via the phone, for 1169 mounted, balanced, shipped, with lugs and rings

uRiDiAN
 
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