I was looking at FICM's also. I did think about upgrading to a 58v one. PHP has the 58v FICM for $700 does that come with a tune? When you say Atlas 40 does that mean 40hp tune? Correct me if I am wrong but you will tune the truck with the x4 but the FICM- can also be tuned for more power? Sorry for all the questions I have been racing cars my whole life and this diesel stuff is a whole new game for me. Some on the site say +100hp FICM tune. So is that 100+hp on top of all your other mods and tune?