Well yes on HP, but the TQ is a bit better on the 660sm after ignition tuning (2nd dyno chart).

However the dyno is misleading - the curve is created via a full throttle roll-on. At lower RPM's (under 3K) and less than full throttle the 266 causes it to buck, bronc and sputter. It wasn't happy... I can putter at 2500 RPM in a right turn and not jerk around. With the 266 it was a burning clutch situation to keep the rpm's up...

 

Well, I got the 120R for twisties - Its in a dyna FXDX so its a sport cruiser. Basically a muscle car... However, I bet most 120R's are installed in touring bikes for the added get-up on heavy bikes.