Lightened diff mod
Serious racers consider the FTX ball diff an essential upgrade. The design is far from optimised for racing, weighing considerably more than the stock gear diff. What's more, most of this weight is completely unnecessary. Full Option can modify your diff for optimum weight reduction, giving faster spool-up times and quicker acceleration as a result.
This is an engineering service provided by Full Option. You will need to provide your own diff halves for modification.