HPI Racing RS4 Sport 3 Tuning Part #114436.
Genuine HPI quality tuning part for easy optimization and tuning. If you're a racer or serious about drifting, you can fit this lightweight spool. The spool removes all diff action for direct traction and braking action, from your trigger finger straight to the wheels.
- HPI Racing RS4 Sport 3 - incl. Drift and Flux models.