I would really like to see an answer to the original question. From everything I've read it seems that there is hp to be gained from cleaning up the heads

08 America, A/I &, Calif emissions "stuff" gone, air box removed & battery relocated, billet intakes, UNI Pods, 145 mains, 42 pilots, Stage 2 igniter, intminators, 813 cams, Progressive 412's, modified seat.