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I have an NHP sport header (no cat) NHP Mid-pipe with cats. NHP sport muffler. Dyno scan software on a performance run before and after installation showed a 15HP change. Two weeks later I added a Cold air intake system This scanned out to another 10 Hp, from the average of the original three runs. Or 24 to25 HP over all. The last bit was a IPD Plenum and 74MM Throttle body and again. It increased the output by 10 HP. The down side was my fuel economy suffered about 2MPG. Either I was on it more or the air and exhaust flow was off. I had Fab Speed flash my chip to see if this could be fixed. It made the Throttle response better I got back maybe 1.5 of the lost MPG and 6 HP. The overall package has my power up by 41 hp +/- 1. It was probably an expensive 41 hp @ $100 each. But when the kid in an EVO come up beside you at a light start reving his engine and you launch it and it pulls you back into the seat as he disapears in the morrors it is worth every cent
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
Last edited by jsceash; 08-30-2011 at 06:18 PM.
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