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Originally Posted by Stenod
Twin 3" downpipes are way more then enough for this car... This is also going to help the car spool faster, yeah it may hurt it at high rpm....
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I've found going to bigger hot sides/wheels doesn't effect the spool time as much as you would think, providing the rest of the system is reasonably well designed. The efficiency and torque curve are muuuch nicer as well.
smaller downpipes making it spool faster? That's about 180 degrees from everything I have personally experienced. My thought was exactly that, it's a street car and he wants it to spool relatively quickly, but without being overly brutal. Going from 3" pipes to 4" made the twin .96a/r 76GTS (on a 510ci V10) spool just under 300 rpm quicker and picked up 150rwhp. Essentially free HP is good stuff.
I don't ever build a car for peak numbers, it's all about the area under the curve and holding the torque as long as possible.
I'm not Tom Nelson or Mike Lefevers, but I did manage to put down 1496rwhp @ 25psi with a hydraulic roller V10 with a stock intake manifold and a 6200rpm rev limiter. And just under 1100rwhp @ 12psi on 93 pump.
