Mac,
My Elky now weighs in with me in it at 3728 and I am still adding weight, but, it keeps going faster and faster with my chassis setup and it is all still a stock frame!!! Of course it has some power to it and, I would recomend a 1.80 straight cut gearset in it if your going to add any big power to it. I run in the 9's and it has more in it still and on all motor. Good luck and let us know what you decide on.
Elkyman
John