How do the original European-spec and North American-spec M roadsters differ mechanically?
BMW M developed two versions of the original M roadster, one for the European market (in both left- and right-hand-drive) and one for the North American market. The European-spec model is fitted with the 321-hp (DIN) S50 B32 powerplant, as used in the European version of the E36 M3. North American-spec M roadsters utilize the 240-hp (SAE) S52 engine, as found in the North American iteration of the E36 M3. Both versions have identical ZF five-speed manual gearboxes, but the North American version is the only one fitted with BMWs ASC+T traction control system (as of 9/98 production). Also, the European-spec M roadster is electronically governed to 155 mph, while the North American version is limited to 137 mph. (U.S-spec M roadsters also lack the “floating” front brake calipers fitted to all other M roadsters.