You have no chance against your buddies. The XF is a high 14 second car in the quarter with the manual. It's probably a touch slower with the auto. The 350z and Mustang GT (assuming an 05+) run the quarter, stock at about the same time of ~ 13.8. Those cars with auto's would run a little slower most likely. Either way, the crossfire is too slow to even be in the crossfire against those cars. You got a good launch because you have far less tq to the wheels and had much better traction as a result. If the race was 400ft and those guys continued to have poor launches, maybe you'd have a chance. Anything longer and it wouldn't even be a contest. Get an SRT6 if you feel the need to "run with the big boys".