With so many shops that tune ECU's (from AL at dynoflash to Works) what is the difference? Anyone ever had a bad tune ? With that said if your just sending a mail in flash can't any shop reconfigure an ECU if they have a listing of all the parts installed? Personally i am going to go with Dynoflash strictly off word of mouth, but am i in the Lemming effect or are some mail in tunes better than others ?