Just got back from the track.Spoke to Bill.(of course this could change)..He said he doesn't care much about running LIPO as long as the charging bag is used and the charger is a LIPO charger.Brushless ....17.5 mixed with stock is cool with him also.No 13.5 for now.So....let me throw something in....Who's up for the rubber class????
Anyhoo.....