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I have a 2004 mustang gt auto. My car is daily driven. I have the usual bolt on's and I am running n/a running a 13.36@102. I should be able to pull at least a 12.9 on a good racing day. Should I get heads and cams and stay n/a or should I go power adder and get a P-1SC @ 8 psi. I am looking to get at least low 12's.