We ve combined performance & great looks into one package. With stock head pipes, nearly all the exhaust from both cylinders is routed out the right side muffler. With Crusher True Duals, each cylinder breathes through its own head pipe & muffler, greatly improving flow & making the bike much easier to tune. Crusher True Duals include heat shields & mounting hardware. The 07- 08 versions & are fitted with oxygen sensor ports. All that s left to do is choose the mufflers to complete your high-performance package – Crushers or Beast Ovals!