PCM Tech Multi-Tune. With the Multi-tune you have the ability to shift between 4 tunes on the fly, rolling anti-lag, 93 oct, E85, Ghost Cam, Pop/Flame etc. These tunes are custom built to your 2015 and up Mustang or 2015 and up F150. The multi-tune uses the cruise control to shift between tunes and the RPM gauge (i.e. 1k, 2k, 3k, 4k) as the tune selector. Additionally, the multi-tune uses the MPH to allow the user to select the Ethanol content and switch E85 set ups on the fly as well. When in multi-tune mode the gauge cluster shifts from operating mode to tune selection mode. This is very helpful when testing at the pump or changing strategies at the track. This tune requires usage of your SCT X4 device or a special OBD 2 device (email us for details).