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We have seen cars running very fast times at the track using stock exhausts. I too believe that exhaust modifications are expensive for the gains and most likely will not consider it as an option. I went with NPP so that I had a nice aggressive sound and a quiet sound.
I am pretty much maxed out with my performance modifications with the exception of a line lock and a converter. There aren't very good options for those two right now, but my car should be a very capable low 11 to high 10 second car without doing anything to the exhaust.
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16 Red Hot 2SS A8: NPP, CAI Cold air, Ported TB, Fasterproms Ported intake, E85 flex, Formatto tuned. 11.80@118 with 1.92 60' (600-700 DA) on stock run flats.
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