2008-2018 Superduty DPF Back Black 4in Dual Single Rear Exit (MAG17068)The MagnaFlow Black Series Filter Back Performance Exhaust System delivers dyno proven performance and a deep, resonant tone in a premium package featuring a black powder coated finish. Engineered with fast flowing 4in mandrel bent main piping, this system is tuned to produce mild interior and moderate exterior sound levels for a balanced driving experience. The dual same side behind passenger rear tire exit is finished with 5in black coated welded on