Yeah my mustang is mostly stock with 155,000...all it has done so far is: cold air, 3:73's, 155 lph fuel pump, shorty headers, flowmasters, msd, underdrive pulleys...well im getting ready to add ported stock intake manifold, 70mm TB and either a 73mm or 76mm mass air, and maybe 1.7 roller rockers....now my question is what size cam can i put in it to give it that cam sound with out loosing power because of my stock heads and stuff?? will the E-303 do it?