I run the trail tech vapor on my 2012 fe390. Very happy with the units and the installation was fairly straight forward once I got my head around the wiring harness. I posted up some of my installation findings here:
Great unit, after installing it the very next thing I did was a radiator fan install. The vapor showed me just how hot the 390 was getting, I can't believe the fan doesn't come standard. The ST is not kind to the 390