Features: The Q4 employs intricate chambers, baffles and proprietary multistage packing material. With the Q4 you don’t need to hear the power, just feel the power!. Less sound equals more ground. Power gains throughout the entire rpm range. Spark arrestor included. Pounds lighter than stock. Rugged design for off-road endurance. Made in the U.S.A.. NOTE: Will not pass 2025 FIM sound regulation.