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For the Milwaukee Eight motor, Cobra modified their PowerPort by enlarging it to become a pulse chamber that accelerates exhaust scavenging to produce the kind of power riders expect. The round shape, bulging from between the heat shields gives a clue to the real power potential it offers. Includes 18mm bungs up near the heads, allowing the use of wideband oxygen sensors; Perfect for use with the new Harley-Davidson auto tuner. Stock H-D mufflers will not work with this head pipe because of the stock muffler’s internal construction. Most aftermarket mufflers will fit.