This actually happened a little while ago when my car had all of my performacne exhaust setup intact and had heavy ass 17s weighing over 40lbs each but never got around to posting about it I dont think. My friends friend had recieved a 60,000 dollar inherentance and purchased a 2000 mercedes S600. Its a V12 and he swore that it would rip my hatch a new one so i took him up on a race. We went from a dig first and I got a better launch than he did and I gained about a car on him through first. I had my chiped computer then so i was shifting at 9k rpms. Second gear I had added another half. Through third he gained that half back so i was back to only a length ahaed. But by the end of fourth I was about two lengths ahead and thats when we shut down. I dont know how it went back and forth like that but I'd prolly blame it on his automatic tranny. He couldnt believe it because its a v12 because same thing happened when we went from a roll. Yeah it has over 400 horsepower but I'm sure it weighs ALOT. Fun times fun times.