On the big oval tracks like velodromes the 6 cell mod cars reached 6o to 65 mph. 6 cell stock went at least 50 mph. When a 6 mod oval car crashed people ask how many pieces the chassis was in. With 4 cell we are still going fast but not as fast, the racing is closer. Setup is more important than it was with 6 cell (you have to pay more attention to detail with four cell cars to make them more effenicent(sp)).