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These MCJ adjustable slip-on exhausts are specifically designed for Dyna models, offering E-approved performance with the added benefit of sound adjustability. The internal valve system allows you to change the exhaust note manually using the provided lever, which can be positioned on the handlebar or below the tank. This ensures you can always return to a legal sound level when needed. For a more modern setup, you can also opt for electric adjustment motors. As with most MCJ systems, the end caps are not included and should be ordered separately to match your bike's aesthetic. These exhausts are a fantastic choice for Dyna riders who want a high-quality, versatile muffler system that provides both style and functional sound control.