Ok, I have advised you about the GP4300's....Your on your own for that one. I told you not to get them...Go for IB3800's or 4200's. Also, I would NOT get a HV. Get something else if you want speed and runtime. A Feigao C 10XL on 16 cells would get you around 40ish MPH and still get 20 or more minutes of runtime depending on how you drive...