i just got the Nistune a couple months ago and all I cans say so far is that if any of you don't have it yet then your missing out BIGTIME. Your all guessing what your cars are doing. Im no expert on tuning but Im quickly learning and although I have yet to actually tune my ecu, I can tell there is more power to be had from custom tuning your own ecu. More to be said but I'll leave it at that...