one 38 should be fine, unless your looking for every last pony.my 38 came off a cr500, they made around 70 hp stock.so I figure they can also feed a 70 hp banshee. they have a completely different power curve though, so that my also play a role in how much carb you need. but the ease of tuning,throttle response, and looks are well worth it. I also ran a larger fuel line and I am getting a larger fuel valve.