909 Slip-On Mufflers for FL - ChromeThe rear is finished with a rolled scalloped tip, not a simple slash cut. The rolled tip is matched with an inner core finished with the same scalloped cut. Inner tip is actually part of the constant velocity, tuned core that gives the muffler its great sound and performance. Uses a 2. 25" perforated core for its traditional and recognizable Harley sound. No unsightly external screws holding in the tip or core giving the muffler a smooth undisturbed