ok i have an aem CAI, borla exhaust, race header w/o cat, roush suspension. what should go next in the majority vote. want to keep in NA. is a cam a good way to go? or throttle body (it's gonna be on soon anyway). intake manifold? i am new at 4 cyl. motors and really dont know how to build one of these things. i love the car but it's way to slow from the factory. vtec civics eat these things and going from a 5.0 mustang being beat by a civic is kinda like a kick in the groin. any advice is nice. thanks for the help.