While BMW is working on a brand-new M2 CS, this tuner just gave the previous generation a whole lot of power and other upgrades. Do you like the spec?

The BMW M2 CS stands as the hottest and lightest ... the M2 CS into an even high-performance machine with up to 660 horsepower and 590 pound-feet (800 Newton-meters) of torque.

2 parallel forward facing cylinders, 4 valves per cylinder, liquid-cooled with Ride-By-Wire ...

2 parallel forward facing cylinders, 4 valves per cylinder, liquid-cooled with Ride-By-Wire Water/oil Cooled 4-cylinder 4-stroke in-line engine, four titanium valves per cylinder ...