The MGP Growler makes your bike sound like a beast with a high-quality carbon fiber canister. Sometimes, though, you need to tame that beast for annoying neighbors or meet special decibel requirements for particular race tracks during track day events. This easy-to-install additional baffle makes it a snap to use and remove anytime you want. Includes all hardware required for installation into the HBR Growler exhaust. Sold individually. Note: For carbon fiber exhaust ONLY.