I'm really considering a tuner for my 96 Cobra. I've found a used SCT XCAL2 Strategy Tuner for pretty cheap (less than half price of a new one). I'm considering picking it up. However, I'm also thinking about picking up a new XCAL3. Would there really be any noticeable difference between them? I know nothing about tuners, so bear with me. When buying one from American Muscle, they advertise free tunes for life. With the used tuner, what would I have to do to receive a tune like that? If it is something I can learn how to adjust myself, no problem. If I'm gonna have to pay someone to e-mail me a tune, it may be cheaper in the end to order though American Muscle since they offer the free tunes. Thanks for any input.