The Harley-Davidson Sprint 440 brings the brand’s character to a new generation of riders. With the BOLT, Dr. Jekill & Mr. Hyde adds a distinctive voice to the experience. The exhaust system combines a design that complements the motorcycle with the freedom to choose your sound.
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Your ride back
03
Nov '26
Dr. Jekill & Mr. Hyde | News
A new chapter for Harley-Davidson. A new exhaust from Dr. Jekill & Mr. Hyde. Meet the BOLT: an electronically adjustable exhaust system for the Sprint 440 that lets you adjust your sound to the moment.
Three sound modes at the touch of a button
Whether you’re leaving home quietly, enjoying a relaxed ride or letting your motorcycle’s character shine through, the BOLT gives you three distinct sound modes. Choose the refined Dr. Jekill mode, the balanced Dynamic mode or the expressive Mr. Hyde mode. At the touch of a button, you can match your sound to your ride and surroundings.
Stay up to date
Want to know more about the BOLT for the Harley-Davidson Sprint 440? Visit our Sprint page to explore the exhaust system and sign up for updates. You’ll stay informed about the latest developments and availability news.