The medusa is a very good motor, BUT, the Caster runs the motor backwards, so if you lawndart into the face of a double, the endbell will pop off if you do it enough times. I know that Medusa is modifying their motors because of this, but I wanted to make people aware. On a e-revo, etc... where the motor is mounted endbell to the rear, it is not an issue.

Speedpassion, Castle, and Tekin all provide good systems, just keep an eye out for temps.

I know if you run a 2600 system at 6s, there is no way a nitro could even begin to come close and you will be frustrated unless you really crank down the throttle, but at that point, what was accomplished. RC Driver got a castle system with maxamps batteries (4s) to go 71 mph in just over 4 seconds.