I have an Xcal II, and I am not so sure I like it. The shifting is the biggest thing you will notice. Other than that, if you haven't done much else to your engine, you won't notice power gains. The tuner does allow a small amount of room to adjust things on your own, but if you really want to change something, you are going to need a new tune installed. It is nice for codes, although I am pretty sure any auto parts store will read those for you anyway. My advice: gears if you haven't already, J-mod & tranny cooler (the correct way to improve tranny performance), and suspension modifications. Of course, I suppose the tuner would also allow you to adjust your speedo with the gears. But if you are wanting it solely for the purpose of improving your drive, I wouldn't.
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