The Bassani Xhaust 2-into-1 Mid-Length Super Bike Exhaust System for 1991-2017 Dyna's with mid controls and 2007-2017 Dyna's with forward controls was designed with a more aggressive tone than other exhaust systems. This stepped stainless steel exhaust system features 1-3/4" headpipes step up to 1-7/8" into a collector to increase flow and improve performance.