D&D Performance Enterprises is shipping dyno-tuned Boarzilla and Fat Cat two-into-one exhaust-pipe systems for the all-new ’07 Harley-Davidson Twin Cam 96 and 110 Screamin’ Eagle engines. D&D Performance exhaust pipes include pre-installed stock factory oxygen-sensor ports as well as direct fitment with no cutting, welding, or grinding required. The new two-into-one high-performance Boarzilla and Fat Cat pipes and slip-ons improve power and torque for the entire touring family of motorcycles.