converting a kyosho inferno 7,5 st us ?

[speedy]

Hi !

I need help finding the right bl setup for a kyosho inferno 7,5 st us truggy !
Woud a 9xl on 4s lipo be inough for topspeeds around 45mph ? and lot's of tq ? or woud a larger motor be better for this truck ? maybe a KB 1700kv on 8s ? i whant to make the nitro guy's cry ! :)