I have herd almost all the new GT's with a tune running in the 900rpm range. I don't know why when even through stock exhaust these cars sound great at 650-750. I run mine right at 700rpm. Anything less then 675 or so you will have to listen to it try to die off of a hard rev or two. The motor catches itself set to 700 or at least mine does. I know you need the rev factor though, I hate hearing a coffee can at stoplights and love seeing import drivers sink in there seats. Just my .02$ on the topic:SNSign: