Joey......

I finally finished Breaking in my Buggy (MXB-3) with the Center Diff.......

All I can say is WOOO HOOO!!!. The low end torque is Huge. Donuts and Wheel Spins all day long, and that INSTANT ACCELERATION that you need just before you Launch off a jump is Right There at your command!......

I would have to Guess (I havent runn side by side with Kupplers 2 Speed yet) that the 2 speed probably has a bit more top speed.
However, the single speed is no slowpoke! Definitely faster than my Viper.
But the Center Diff DEFINITELY has the Advantage in the Dirt. I think I'm gonna put some Taller (Cushy) Tires on the Buggy for Jumping, just to see what she will do!