I wont go as far to comment upon anybodies abilities other than to say I purchased a new box with tunes programmed on it supposedly to suit my vechile given that I was asked for and gave my cars details. Luckily for me, I was fortunate enough to have a friend with I dyno and after loading the pre programed tunes we found it actually lost power. unfortunatly my friend does not have the software required to look into whats going on and find whats wrong & fix, so now im stuffed until I can get a custom tune done. My advice..... forget the pre programed tunes and get a custom tune done to suit your vechile.