OEM+ Stage X V1/V2/v3 upgrade to V4
Fiesta ST OEM+ Stage X V4 Tunes are now available!
- Torque truncation in over drive gears for superior knock control
- Advanced and proprietary OAR strategy to react and pull timing faster than OEM
- Increase in midrange power on e50, and more midrange/top end power on 91/93.
- Smoother drivability during tip-in conditions
- More power mid range and up top
Only select the upgrade all map options if you have more than 1 map already and are upgrading multiple maps to V4.