MrSkippyJ Posted November 27, 2014 Report Share Posted November 27, 2014 multiplying the area of the opening by the length would give port volume multiplying circumference by length gives interior area of port I'm with you. but what is that measurement used for? F150: Stock 2019 Harley Road Glide: Amp: TM400Xad - 4 channel 400 watt Processor: DSR1 Fairing (Front) 6.5s -MMats PA601cx Lid (Rear) 6x9s - TMS69 Link to comment Share on other sites More sharing options...
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