I have a ton of BSM's but with 3 second K mute and rear arrow mute i didnt need TMF. I passed the BSM's within 3 seconds and the rear arrow took car of the rest. But my new rout to work i get behind LL hogs and its bad. I believe the upgrade is $279 last time i checked, so i would probably just by a new V1. Ill have to check again, my 3.892 was just before TMF.