Does anyone know much about these? Do they store the stock tune like the Predator? Is one better than the other(SCT vs. Diablo) or have more options? Looking at 2.93 or 3.10, belt, and tune. Want to retain my pulley guard since it's custom painted so I'm going to be running no idlers. Trying to get $$$.$$ figures and vendors lined up so I can order everything I need and get it right the first time. Dyno scheduled for April 3rd.