To sum it up... Despite all the power the new 400+ 5.0L brings to the street, its factory exhaust system compares better to the likes of an electric car than that of the stout performer that it is. JBA's new 3” Stainless 2015 Mustang axle back system was designed to correct this issue once and for all! After considerable testing an all new JBA 3”muffler was designed for the 2015 Mustang. This new design creates a deeper tone and adds character without interior cabin drone. JBA’s new 3” 2015 Mustang Axle Back with the sound that one expects of the modern day performer.