I believe they already admitted closer to 525. Ford GT, Viper and the Z are all underated. Welcome to the good ol' days.Luna. said:That car is running nice. The stock C6 Z06 that I saw dynoed at ~420 rwhp, which is about a 16% loss through the drivetrain (which seems reasonable). I'm willing to bet that Z06 is running a wee-bit more than 505 at the flywheel stock.