I've tangled with a newer GTO that took us over 140. Because I'm told that 140 MPH is governed and my eyesight isn't what it used to be... but it looked like 150 to me. Several Stangs. But for us to be equals with the GT I'm not seeing results that match. I getting them by a few cars or more. Might be the driver, but some were from a roll. I'm as stock as the day I got the R/T. The Mustangs that I have run sounded to at minimum have exhaust. If one hands me my butt I'll be sure to post. But so far no losses. But then again I'm not into running cars I know are faster. Vipers, Vettes, and Supercharged Stangs ect... And the truck guys, whats up with them. I've been jumped on by all the brands.