Here's an email i got from eric reguarding the lope extreme x tune
I have the lope tune, we've had it for a while but I recently released it. Sometimes, when these trucks warm up, it loses some lope. There was a way around it, but I wasn't happy with how it had to be done. So, I decided to refine the lope as much as possible and keep it as simple as possible.
Yes, the Xtreme X is our highest power tune. It will work on stock FICM or with any of the custom FICM tunes. The program takes advantage of some of the limitations removed in the FICM tuning and will give you as much power as possible with the 6.0L, but still safely. No timing increases or any hacks for more power, this is all done through our normal and safe tuning measures.