06-16 HARLEY FLHX2: Vance & Hines Oversized 450 Slip-On Exhaust (Black) Bigger is better. The Vance & Hines OverSized 450 slip-on line for touring models takes it to a new level with massive 4.5-inch diameter mufflers. Finished with equally large CNC-machined billet end caps styled with a slight taper and race-inspired flutes, the OverSize 450 fits and looks the part on baggers with extended skirts.The OverSized 450 slip-on line also puts out a big deep-toned rumble tha