Looks to me, that simply porting the heads will add 45RWHP, then their cams give another 15 for a total of 60RWHP for us 99-04 guys and 110 for the 96-98 guys...and man the modular looks VERY simple to build. Anyone notice we basically have blower cams from the factory .510 intake and .530 exhaust...not sure about overlap, if its blower friendly. I wouldnt mind sending them my heads when i forge the engine, wonder if they would P&P them for me? Houston performance will probably do it,if they are still around. Tempted to do it before, just to gain 40RWHP LOL.