The only reason I worry about lower compression is, let's say I get the paxton system. With lower compression I worry I may lose some power on the bottom end of the rpm's. Everything I read says the paxton starts pullin around 3500 to 4000. How much would I have to turn up the boost to make up for the lower compression, and would it be harder to tune at higher boost. I know the real awnser to my questions is how much do I want out of this truck. Well, I would think 800hp would be awsome, and would probably be cool with that for quite soom time. At what hp do you need to start thinkin about lower compression? There is alot to think about, each system (paxton,roe,sts and soo on) can deliver the power different. I would love to have this truck pullin hard from a dead stop and just not stop pullin till you let of the gas!!!! If, I have to choose when the power hits the hardest, well, not sure yet.