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I have a 99 coupe with a vararam intake and borla stinger exhaust. I am not interested in h.p. numbers, I am interested in quickness. My son says that I will see a better gain with better tires because of traction. Dollar per dollar, which way will give me the best results. Also can anyone give me the build sheet info on vin # 1G1YY22G6X5101986, I want to upgrade the suspension, but I do not know if it is z51 or not.Thanks for all the help.