It usualy shifts the power band up the revs, Fast road its generaly what you would use, when you get into Racing and Rally cams you will need remaps etc.. and it will stall unless its ticking over at 1500+ (which is why rally cars idle so high) But yea... a fast road cam will certainly shift the powerband up a bit, doesnt nessasarily add power without other mods but seems like it because you get less to begin with then suddenly hit that power band. With an induction kit and good exhaust system, mabey even porting etc.. you coul see big diffrences!