The B4 as most of us are running it is dramatically underweight because it was originally designed to be run with nickel batteries. So, we have to add ballast. Guess what? That ballast is above the chassis, like it or not. An aluminum chassis is the best way to increase weight where weight should be; as low as possible and as close to center as possible. ThunderbirdJunkie thinks, however, the car should be built more like a GT2 or XXX-NT (or B2/3, for that matter), with a separate front clip with the kickup built into it, rather than the DEX210 or 22 that has the kickup built into the chassis. It makes the chassis more susceptible to bending. Ask ThunderbirdJunkie's old GT about that