After installing the stock headers I was having issues with knock retard and the engine just couldn't breath over 3500 rpm. Kenny from Clemmons Motorcycles test rode it and he told me right off that I needed a good stepped header and he recommended the Bassani or D&D two into one exhaust system. See Kenny for all your motorcycle needs at​ #ClemmonsMotorcycles​ Eastern Performance has really good prices on aftermarket products and has always provided great customer service.​ D&D Exhausts have a reputation for great performance and quality products.​