dittos on the 3s set up. at my track 'ocrc raceway' they are running 2s on tenth scale esc's and 6.5 2s seems to be as much as you could possibly handle.im running 3s w/novak 7,5 hv and to be driveable i turn down the EPA bellow 80 %.My rcm .5 without the arm kit weighs 5lbs 13 oz and the 10th scale stuff worked but during bash sesions would run 190 very quickly plus i have all the ofna aluminum hopups and wile i rarely brake it weighs a tone so i went HV.if i could afford a NEU set up this probubly wouldnt be an issue but i cant and novak is just up the street.The hyper w/10th scale weighs 4lbs 5 oz or ther abouts so it takes less to push it .i do think a .5 in stock trim would wiegh up simalarly andwork quite well on a gtb