D&D Exhaust's Boss Slip On mufflers for the 2010 Triumph Thunderbird, Part 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.

45 degree cut corrects the stock "cantered out" mufflers for a custom look wrapped baffle.

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.

Even more power increase is expected with hi-flow air cleaner (none available at the time of testing).

See the Installation Instructions in the Attachments tab above.