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Ahem... the "usual" mods a la GRAH1 site and others are adjustable braking (handy for backing off the brakes on a mag or high-motor drag, car), adjustable resistance (usually down from your normal controller. Enables you to not have to press the trigger as far. Helps with more powerful motors).
Another mod is an adjustable choke so that if your're racing on a track with higher voltage than you're used to then you can turn the supply down via your controller and hence retain driveability.
Mark.
Ahem... the "usual" mods a la GRAH1 site and others are adjustable braking (handy for backing off the brakes on a mag or high-motor drag, car), adjustable resistance (usually down from your normal controller. Enables you to not have to press the trigger as far. Helps with more powerful motors).
Another mod is an adjustable choke so that if your're racing on a track with higher voltage than you're used to then you can turn the supply down via your controller and hence retain driveability.

Mark.