i have a 2002 mustang gt and i have a bbk cai and for the exhaust i have o/r mac pro and slp catback. now i was looking into buying the comp cams 270 cams COMP Cams 102600 - COMP Cams Xtreme Energy Camshafts - Overview - SummitRacing.com ... now my question is, should i do it? or should i get headers first? and if i should get cams do i need springs, lifters, and a tuner? like the diablosport? or do i install them and get the car tuned at a shop?