wud I keep up with a cobra?
Get the LS6 intake, and a really good tune with hptuners (street tune) to go along with the headers and you'll keep up with a stock 03/04 no problem.
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Thats about dead on target..........13.2 in my 2000 with 3:15 A4 lt's, tune, vortex. However it was 92 degrees last time.......should do high 12's closer to fall temps.
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