This car is basically the Z3 with a higher performance engine. The engine is a 3.2 litre Inline 6, that provides 315hp and is a great improvement over the 2.8 litre engine, which is the biggest offered in the Z3. The M Roadster's top speed is 155mph, which is about the same as it's main rivals (the S2000, SLK 320 and the TT). The car has terrific acceleration (0-60 in 5.2 seconds) and costs $43,000. This is a very good value and is neck and neck with the Honda S2000.