Can't wait to get my hands on this! B6D does not look like a bid departure from the B5M but sometimes change isn't easy to see and it is the little things that make the biggest impact! The one that interests me the most is the B6! Looks like a sweet ride!
Have a guy here that runs a B5M with the laydown tranny/high grip box on a Med to High bite track and he is pretty damn fast with it. It is a dirt track and the traction is somewhat on and off but lately he has this figured out pretty well and VERY Competitive with his B5M Laydown Tranny. So basically, i would venture to say that the B6 would probably do better than you think in a Med bite track if you take the time to play around with it!
Either way can't wait to get one!