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Rahn's Motorcycle Engineering - Call today 781-878-3683. At Rahns the only official Power Commander Tuning Center in Massachusetts, can optimize the fuel and ignition mapping for your motorcycle. They can also develop custom maps for special applications. All Dynojet Approved Power Commander Tuning Centers have the latest state-of-the-art Dynamometers and testing equipment. This includes the new Dynojet Model 250 Load-Control Dynamometer and the Dynojet realtime Air/Fuel Ratio module. Rahns have successfully completed the Power Commander technician training course at Dynojet Research.