Advanced racers run diff wt's front to back to help balance the car under hard braking & turn in. HPI's have a tendency to want to swap ends at turn in. The majority of that prob can be solved with proper spring rate, shock oil wt & piston. using differnt diff wt front to back is best looked at as a way of fine tuning the cars response after getting the shocks and ride height the best you can. As a basher you should tear em down & rebuild once a month. As a racer between every week end and as a team driver every day if not every race. Hammer down Bro :smoke: