the xcal 2 just was released like a few weeks ago its alot better than the xcal 1 cause it has the datalogger in it, and the xcal 1 dosent. i just have a chip they all do the same things but you have the datalogger. we will all get the same gains in hp and tq if we all have the same mods, thats a verry wise choice of a purchase, who did you buy it from???
