Your heads are the HP bottleneck now if you go to a bigger cam. In mildly modded form, about 115 is a realistic limit depending on core shift and how "happy" the dyno is. Mine is the most conservative one that I know of here in the Phx,az area. When I did my kit, I went with the 2.120 intake valves, bullet nosed the guides like the older 110 heads have, and a 5 angle valve job. I have a self tuning replacement computer, the T-Max, and its great! The self tune deal works well thru all of your parts replacement playing around, then when you are done, any competent tuner can pull more on the dyno. The deal is it will self tune thru the pipe, air cleaner, cam, and throttle body changes by it self, so you only pay for the dyno work once, if you even decide you need that last few HP. TIMINATOR