There seems to have been a lot of discussion around weight the past few days. I user a fair amount of weight on my b4.1. These mod buggies are so fast with brushless motors that it helps to add some weight to the key areas of these cars. 1. to keep the nose down on high traction and two to balance out the chassis side to side as the esc and wire are actually alot more weight than the rx and transponder. Addiont weight is a good thing when used correclty. It does not matter how you lower lap times... If you can drive it more consistant, with better forward bit I don't see any issue with that...