S&S CYCLE - GRAND NATIONAL SLIP-ON MUFFLERS - 50-STATE - GUARDIAN BLACK - M8 SOFTAILGrand National Slip On Mufflers 50 State Guardian Black M8 Softail Highlights Improved horsepower and torque (when used with a Stealth Air cleaner kit; sold separately) Race inspired design Removable dB reducer for back pressure and sound tuning Meet J2825 levels for sound All hardware included Deep performance rumble replaces stock whisper tone No mapping required Sold in pairs Made in the USA + Fitment 2018 2019 Harley Davidson FLFB Fat Boy 107