How much HP will it deliver?

What rpm rangedo you have to have? Unfortunately... I have no CLUE what you're doing with it...lol. I have a truck, and it never goes over 3500rpm...lol. I have cars that dont need power below 4K. So maybe the place to start is the weight, gearing, and expected rpm range you will need. Do these things have crawler transfercases? Ultra low gear reduction?