HPI Savage OFNA throttle/brake mod

Fixes these issues:
Brakes are weak
Car shuts off when braking due to closing the carburettor MORE than idle setup
Carburettor does not fully return to idle configuration, sticky throttle.
Carburettor does not open fully even on full throttle.

Needs some hardware, picture for illustration. Remove stock throttle/brake horn and install a normal one.

After you have installed, be careful how you tune the brakes! The truck will front-flip or lock up all four wheels at maximum tightness!