I currently have an Xcal now, though i will be updating to the xcal2 when it comes out, the only difference really between the two is the ability to datalog w/o the raptor which for some reason is no longer avail. How much power you get out of it really depends on the Tuners ability and knowledge. Kauffmans Motorsports is a perfect example, they were able to eek out more HP than my previous tuner with the same mods. But either way make sure they tune your car on a dyno with a wideband 02. Good luck!