S&S CYCLE Grand National Muffler 550-0757B

Stock mufflers are engineered for whisper-quiet operation and emissions compliance—not performance. The S&S Cycle Grand National Muffler swaps that compromise for a race-inspired exhaust note that delivers measurable gains in horsepower and torque when paired with a Stealth Air cleaner kit. Whether you're chasing dyno numbers or simply want your engine to sound as aggressive as it runs, the removable dB reducer lets you dial in the perfect balance between raw power and street legality.

Built in the U.S.A. with precision engineering, this bolt-on muffler pair ships complete with all hardware—no fabrication required. CARB-exempt for 2018–2020 models, these slip-ons prove you don't have to sacrifice sound, performance, or compliance.

• Removable dB reducer
• J2825 sound compliant
• Measurable hp/torque gain
• Requires Stealth Air cleaner
• Bolt-on installation
• Sold in pairs
• All hardware included
• Made in U.S.A.
• CARB E.O. #K-010-16
• No ECU mapping needed