03. The Jackpot 4-inch Mufflers are available in slash-down or slash-up versions for ’09-12 Touring models. Jamie tested different baffle designs and lengths as well as different chamber designs to get a set of mufflers that not only perform well but also provide a good note without being too loud or too quiet. The mufflers were redesigned in 2008 to work with Harley’s new underslung head pipe design. The left and right side are chambered differently with an asymmetrical baffle system that uses the right side as the primary muffler and uses the left side to produce maximum low-end torque and horsepower.