USB 3 would be the correct one, but be sure that you buy it from someone who has a DynoJet dyno to set it up for you. Ask them if they could map each cylinder independently as the USB 3 has a function called "advanced mapping"

. They would have to weld lambda bosses one each exhaust header as one cannot reach each header through the exhaust cannisters!

They can then screw the lambda sensor (which is mounted on there exhaust gas pump) straight into each of the headers and make a map for each of the cylinders!

This would ensure the best possible mapping for your bike, I know, as I have mapped many this way.
