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Probably best bang for the buck is the '04 specials that have been running.
I would guess on a 2 mile track penske's, koni's, etc.. are still 1-2 seconds quicker but I bet the '04's will pick up your stock 2001 at least 1 second.
I couldn't believe how much better power application is on my '03.
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Before: 381rwhp and 362trq - Kooks, Vararam, ti corsa, penske sa, drm ducts, Nitto NT-01 (275/315 combo)
Before Track Times: 2:11 VIR, 1:21 Roebling, 1:49 CMP
After: 430rwhp and 382trq - MTI Cam, MTI Track Suspension
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