Unfortunatly the belly radiator has to stay and get plenty of airflow. It Has to get rid of of not only cylinder head heat but also oil/crankcase heat. The heat exchanger I used is one from the wine industry and has more than ample strength and flow(it is in the suction side of the pump,and the coolant pressure is only what the Rotax/BMW radiator cap will support) laminova do a better unit,but at a not so great price.