Ok well I just got done installing a FP Red turbo 84mm ported with a equal length FiD manifold and fic injectors and im with tuned to speed density I read many threads on this some say lifters others say its ok. I had this before but it wad not as loud, also I am useing the FP oil supply line from.re oil ilter houseing and blocked the supply in the head. I noticed it louder after I fixed the exhaust leak from my o2 dump as I used the oem gasket and it allowed air to come in and throw the o2 sensor off I think it needs a road tune and assume timeing might cause this not sure. It does it like the thread "dead lifter (video inside)" shows but im non mivac also I have comp 272's stock drive train reving to 7800-8k.