Torque Developmeny (www.tdi-plc.com) have a supercharger kit for the M3 which ups the performance to 435bhp and 369lf/ft torque for the 3L cars and 450bhp/406lb/ft for 3.2L late models. These are off course, Euro spec vehicles. So does any have a s/charger on their M3 and what sort of problems have you experienced (if any)