the tune is the only thing you will actually feel. All this other stuff is fluff , do it if you want but you wont be able to measure the gain with a stop watch or dyno. You will be told , spools faster , quicker response , crisper..... its mainly imagination and placebo. No shop has shown that a cai does anything. Hell even a tune , which tests out at a huge gain doesn't alter the personality of the truck that dramatically. Bolt on fluff is for fun only.