im debating whether or not i want to cam my 02 v6 mustang. is it worth it to cam my car if i dont do heads and lower intake at the same time? i mostly want it for sound but the performance is an added bonus. im thinking about a duration of 218/224. what do you guys think? and about how long is the install? because im gonna have to pay to get it done. and do i just need springs and retainers?