Here is the Dynograph off their site.This is for full Akra Evo system including y-pipe. The gains are not that great knowing that they compare it to stock system with cats as a baseline. I would assume that 17hp difference is hardly to be felt past 5k RPM. I would think that Miltek or any other system which replaces the y-pipe will demonstrate exact same performance. Im not saying it is a "bad" system just want you to see/challenge what the manufacturers are trying to make us believe.... In my oppinion if you like the design and sound then GTC TITAN is the system for you to consider.