I recently ordered a custom dual pass radiator. If anyone is having issues with overheating due to added horsepower & continuous high rpms (track days, hs touring, etc) then you may consider getting one of these radiators.

My link

This is the only dual pass radiator that I am aware of. All other S2K radiators (stock & aftermarket) have a top down flow with the inlet & outlet on the same side. I don't see the logic in this. I also wonder why they put the main fan on the other side.