Actually, it's a Spec Slash class. Whereas Stock Spec Slash only allows changes to the pinion (and, maybe, a few other very minor changes...I'm not 100% certain), Spec Slash only requires running the stock ESC & motor, and tires. Anything else you want to change, as far as I'm aware, is "ok". Want to swap in the LCG chassis? Go for it. Want to switch our the (garbage) Ultra shocks for GTRs? You bet ya. Want to change the 2075 servo for something faster/stronger? That's also allowed. Want to replace the plastic shock towers with CF towers (of you know where to get them)? You can do that, too. It's not a 'sanctioned' class.