I don't know much about the Dinan version, but the M3 CSL stands for "Coupe, Sport und Leichtbau (light built). " The roof is from carbonfiber and is approx. 6 kg / 13 pounds lighter than a regular M3 roof. I know that for sure because a friend of mine helped engineer it. It was one of the biggest goals of the project, get the center of gravity lower. The engine has 360 hp and the car weighs in totoal 1385 kg (3054 pounds). Tis means you do not get a radio, electrical windows and stuff like that. It has options like launch control, different compound brakes and I know Michelin developed a variant of the Pilot Sports especially for this car. According to the german BMW site, the prices in Germany are 55.000 euro for a regular M3 and 85.000 for the CSL.