My 2 bits, I was in a saloon finishing lunch (after fishing all morning) and had on my M3W T shirt. A guy recognized what it was, I said I own one, he says he is a Polaris engineer who was just at S&S to meet regarding emissions testing for a big bore kit for their Indian Motorcycle. He said S&S had a M3W there for the Euro 4 testing, which passed with no problems.