ok...i have another question, i just broke the right front lower arm from just a little jump...18 inches or so...gonna order parts to fix it, should i upgrade all four arms to aluminum or just stick with plastic? i have read many posts saying that to many aluminum parts make the truck heavy. the plastic is very thin where it broke(right at the hinge pin). ok back to my first post...stock top speed with the volcano is 17mph...with a 8 minute run time on 2000mah is that about right...