Livernois Motorsports

The tire size adjustment currently requires a secondary device unfortunately. The 2011-14 F150 Ecoboost was adjustable through the tuning device. The 2015 F150 requires access to the body control module to calibrate the speedometer.

MotoMedic

What secondary device do I need?

At some point will the X4 be able to program the speedo or likely never?

BigBlue&Goldie

Hypertech makes a module for about $275.