Headpipe Db Black 17-19 FlDual Bungs Pro Chamber HeadpipeFor 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 18 mm bungs up near the heads, allowing the use of wideband oxygen sensors; Perfect for use with the new Harley Davidson auto