SP Concepts 2006-2017 DYNA - BIG BORE 4.5 The 2006-2017 DYNA - BIG BORE 4.5 by SP Concepts is a high-quality exhaust system designed specifically for Dyna motorcycles from 2006 to 2017. This exhaust system features a 4.5 inch big bore diameter, providing increased power and improved exhaust flow... Was: Now: $1,199.99 Choose Options
