Will, I don't know what your stock car looks like or has on it but Joe B. has the BMI chassis and he was a good 3oz lighter than my stock tub and mine was at 51.5oz and besides when you go to big races you just have to add weight anyway. Also I think that the car is [U]at least[U] just as stiff if not stiffer as the stock tub. Plus it looks killer and performs better.