If you are purchasing a head, you want to go black instead of orange. 2 reasons, blacks are sped up faster and also have better or lower angle tins above the strippers, (fewer cobs will bounce out). I never have had to speed up a black header. Also on my M2, there is a belt tensioner on the header drive belt, run it up a few inches and it spreads the big pully on the header drive shaft making the interal diameter smaller which turns it faster, I never have had to do this either. you should be fine. Good luck