I was so certain that we I had written this car up before as the Racing Dynamics prototype, I initially wrote the headline up as a “revisit”. But the year was wrong, the wheels were different, and then I noticed something – that earlier car was an R48, and this car took it to the next level. A full bored and stroked 4.93 liters, the RD50 pushed the performance envelope past the M5. With discrete body modifications and some of the best looking aftermarket wheels ever fitted to a BMW, this is certainly a unique alternative to the normal E39: