D&D Thunderbird 1600 Boss Slip On: 557-12F 2010 Triumph Thunderbird Boss slip-ons, Number 557-12.
Experience an immediate 10% increase in low-end Torque. Our Boss Slip-ons utilize stock heat shields and are a snap to install.
We\'ve modified the mounting so that they shoot out the back perpendicular to the rear wheel... giving it a custom look. Must use triumph download #020298.
Price Includes Free Shipping US Overseas will be ACTUAL shipping over site price minus $10 $544.00 $489.60