My suspension was bone stock, with a little added preload in the rear, 6s Zippy lipos, CC1717 motor, 10t pinion, and 7075RCs motor mount. I ran the balls off that car this weekend and she pretty much took it like a champ.
I think Muddy was running stock motor, 813 carb, jet-pro side pipe, 7500 spring, .05thousands head gasket, gearing looked (i never counted)to be standard 29/31/25/25 buggy gearing, 40wt in the rear shocks and 20wt up front. Im just going off memory here so I could be a little wrong. In the MT class he ran with stock XT wheels, in the buggy class he was running some older MCD RR Evo 3 wheels/tires he got for $25 a full set at LargescaleRC.
Im pretty sure Rob64Ns setup is very similar considering he helped Muddy set everything up on his prior to the Powerjam. They will chime in and correct me if im wrong, that I am sure of!