Honestly it worked out good for me what i got for the heads. I deff. still need a tune as the idle is up and down sometimes at a stop and I need to get the fuel right. But all in all i'm happy with the out come vs before. I'm sure I did loose some HP taking the old heads off, but if my wife didn't need to get some stuff for her car I would of have the charger or turbo setup to run those heads the right way. Ohh well, theres always another build.