I want to have a decent intake, I have mac fenderwell cold air. I heard bigger mass air and throttle body is a waste of money . But intake runners give about 7 lbs tq. and about 6 hp . throttle body spacers are questionable but I might get it anyway.Has anybody installed 1.8 roller rockers on their V6 pony? If so how much and where did you find them? Any HP gains? Is it safe?