Fire in the exhaust

Please, it would like to know by which I motivate do not leave fire in the pipes of exhaust of the cars of the game Grand Prix 4?
Already in the cars of the game Nascar 2003, GTR and GTR 2 this is possible?

Célio Jr. - Rio Verde - Goiás - Brasil

It was in GP2 when you change down gear, but not in GP4 I'm afraid.

gp3 too i think. but since then the positions of exhausts has changed a lot and today it´s almost impossible to see the flames. i remember a tv broadcast prior to the 2000 season about ferrari tests: it was already evening and schumi went into the pits at fiorano. when he changed down from 1st to neutral blue flames left the exhausts which seemed to be almost half a metre long.