Part Numbers: 21-00037/2 Sound Reducing 1½” Baffles for all 2" Chambermaid and Stubbie systems.     • Also works with Rinehart (manufactured by BUB) 2 into 2 systems     • Provides increased Torque and Low to Mid range performance. 21-10032/2 1¾” Chambermaid/Stubbie Baffle Pair Standard replacement baffles NOTE: Indicate part number desired on your order form under the "special notes" section This product is designed for use on closed course competition motorcycles only. Click Here for More Information http://www.bub.com/Emissions_Information.cfm