Well that is the kit that I bought, and not to debate as it would not be worth our while, there is no longer an a trim kit. The A Trim kit was eliminated as it was not efficient. The only difference, per Vortech themselves, is with the "S Trim" kit you get a bypass, a BTR I believe, an 8 rib setup, and a couple other external goodies. The head unit is exactly the same, and in fact the SC trim can handle a faster impeller speed. The reason that is, is because how the impeller is cut inside. Basically it takes next to nothing to make the sc trim an S trim, again PER VORTECH, but its not worth buying the sc just to upgrade it if S Trim items are what you want. Right now I am running 9.5 lbs of boost on my sc trim and loving it. About to do a H/C/I swap as well. I do agree with Cory on the heat issue though, as that is def true. I know I may not have helped much, but just wanted to give a personal testimony of what I know and do. If you want specifics, call Vortech. Trust me, its worth it and they are more than polite.