18-21 for Harley FLSL Grand National Race Mufflers for Chrome 550-0738 Studs with 5/16" thread size

Studs with 5/16" thread size have 7/8" head size

seven zippered gear pockets

Fully removable Hydradry™ 3-piece moisture wicking liner

and jaw piece vents are a bold design that can be fully opened or closed with a “gloved” hand

18-21 for Harley FLSL Grand National Race Mufflers for Chrome 550-0738 Studs with 5/16" thread sizeManufacturer: S & S Cycle MPN: 550 0738 Title: Grand National Slip On Mufflers Size: Option: Color: Chrome Show quality Race inspired Grand National end cap High flow perforated baffle with removable dB reducer Bolts directly to stock header pipes or S&S Power Tune duals Aggressive sound and excellent horsepower Made in the U. S. A. DISCLAIMER: Not legal for sale or use in California on any pollution controlled motor vehicles. We cannot ship these