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Link doesn't work, but it's no secret in the Harley world that when they can't figure out how to do something they contract Porsche for engineering help.

Three famous examples. In 1986 when their bikes were notorious for leaking oil, the Porsche designed "Evolution" engine put a stop to most oil leaks. 2004 and later Sportsters have the case drilled for Turbo oil squirters, courtesy of Porsche. And lastly the V-Rod engine, also a Porsche design, is a 1150cc watercooled powerplant that puts out 115 horsepower, something Harley couldn't do to save their own lives.