Factory 4.1 Slip-On Muffler

Factory 4.1 Slip-On Muffler

The lightest mufflers available

Superior power and performance - horsepower improved throughout the rpm range

Feature exclusive proprietary Chamber Core technology

Factory Forward Engineering centralizes mass, improves handling

Made from premium quality American materials

Customize with performance tuning inserts and spark arrestor module

Meet AMA sound requirements on most models; inserts available for others

NOTE: Will not pass 2025 FIM sound regulation