You're ditching a ton of performance ditching the AWD, especially for a PERFORMANCE SUV. The more power to the ground at the same time, the better. That's why you hear a lot of disparity between HP at the flywheel vs wheels. Most car companies will market their cars rated at the flywheel, not the wheels. Marketing..... Otherwise you're twisting up that extra HP in the tranny and driveshaft only putting it down with 2 wheels. If you twist it up too much you'll snap that driveshaft. Usually the first upgrade after a huge power adder (Turbos, blowers, etc.) is a driveshaft upgrade for this very reason lol. Whenever they snap, that shit is LOUD! After I had that happen, I actually always had nightmares that the rear break of the shaft would fall and somehow impale my car right after I launched or something lol.
If you have a tranny brake for launching, that's exactly what they're for, and they're the best way to launch. Sure, with just 2 wheels of power with a RWD, eventually it'll spin that energy out, but meanwhile you just lost 4 car lengths lol. That's exactly why you see AWD cars blow past RWD launching in a race, then you'll see the RWD cars walk back up on the AWD while they spin out that extra driveshaft twisted up energy out to the wheels. Physics in action! Sadly they always catch up after the race is already over lol. I probably shouldn't be educating so much on street/race knowledge...