In the B6 Facebook group, Kody said for OCRC (med-high grip) he would run the B6D and sometimes the B6. I think it would be wise to get the B6D then buy the components to make it the B6. Complete laydown transmission with its waterfall, gullwing front arms and tower. If conditions call for the high grip, then swap it out. Honestly the only dirt tracks I know that have carpet/turf grip levels are SRS in Arizona and Beachline RC in Florida.