A few months back, Slot car corner started selling a motor for $8 that is comparable to a Slot.It organge bell. Piranna: 21,500 RPM / 165 g*cm – dual shaft just like the slot.its. The slot.it O/b is slightly stronger with 170g*cm torque – not sure how much difference that makes, esp. with the variables of our track=11volts and motors have a 10%+/- variance. I have not tried any yet but plan to get 3 and tach them (after break-in) to compare to average RPMs from the slot.its O/b.