A major piece of the power comes from just the intake cams. The big issue is that you can get basically free horsepower for no loss in torque with a correct sized exhaust cam. Over the stage 2 intake though your going to run into a point where its really nessasary to run an exhaust cam. This is a good option for people who want to run a forced induction system. Lets your engine breath without opening up the overlap. But for N/A you get alot more options for upgrades in the header system. If you make your own headers or get a custom set you can power tune them to a certain rpm band because of the larger over lap. This really doesnt work very well on small overlap cams because there isnt enough time when both valves are open. Plus overlap only badly effects the 2000 rpm and lower area. So by popping in a bigger exhaust cam you loose a couple of footpounds below 2000 rpms and everything else gets bigger. There are not very many upgrades that come with a near free compromise for horsepower. But this one doesnt really sacrifice much so most people get both.
The customs are way too expensive. These cams really cover about everything. They are seperated by 8 degree`s all the way up. Anything less the 8 degrees and I dont think you would really feel or see the diffrence. On average each curve minuses or adds about 3-4 percent in torque. So smaller increments would only be worth 3-4 ft lbs of torque in the in between humps. What are you looking for just exactly?
