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I have both the IPD and larger throttle body. It's an expensive mod. I would do it again if I had the need to. The parts alone don't help as much as the claims say. It isn't until you retune the car. Then you feel more improvement.
In short to get the improvement you have to tune and buy the parts.
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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
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