There are not many people out there that they actually are aware of this. California based company Dycorp was most probably the first company that had designed and fabricated a twin exhaust system for the JS550. Back in those days the 550 engine gained 19hp and the exhaust system was designed to operate with stock Kawasaki pump and with OEM or aftermarket waterbox. The only thing that puzzled us was the fact that none of the reputable and top legendary race 550s used this exhaust system.
