Why do professional race cars spark and flame as they brake into turns during the night portions of 24 hour races? In the days of carburetors, I can understand: at high rpm carburetors are too dumb to stop pouring in the fuel despite the throttle valve being closed. But a finely tuned modern fuel injection system? How does that much unburned fuel get into the exhaust system? I would like to do the same thing to my car. I am hoping that a few flames will keep those darned Porsches and Lamborghinis a little further off my butt as I enter turn 11 at Laguna Seca and they anticipate the inevitable point-by. I drive a 1991 318i sedan.