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A 10hp motor running off 12v is going to need a 1000 amp speed controller and huge cables, you are also going to need a 12v battery that can handle that 1000 amp draw, even a pair of golf cart batteries, at 210 amp hours, 6v each giving a total of 12v is only going to be able to give you 10hp for around 6 to 10 minutes and is going to need 18mm cable or 3/4" copper cable, or you can bump the voltage up and shrink the cable size and the number of amps needed, a much better idea because you are not going to find a 10hp 12v motor, a 72v motor is about as low of voltage as you are going to be able to get away with, then you need to figure out how you get that motor to connect to your wheels, it can either connect via the engine or it can bypass the engine, they each have their advantages and disadvantages and you need to look at your vehicle and figure out what will work.
You also do need a speed controller, otherwise the motor is on full blast, it's like revving your engine and shifting in to gear, you will brake stuff!
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