Let me start by saying that i race off road not on road.

I have a family member that has too much money and asked me to build him an rc car that went over 100mph but i dont know where to start.

what on road car?
1/10 scale or 1/8 scale?

how fast more or less can i go with a mamba 5700kv and 3s lipo?

Remember money isn't an issue...at all.