The aFe MACHForce XP axle-back exhaust for 2014-2016 BMW M235i (N55) uses mandrel-bent 3" to 2.5" 304 stainless tubing with a high-flow black stainless muffler and dual 4" black clamp-on tips. It mounts to factory hangers and includes a factory-style exhaust valve (factory motor not included) plus an integrated mitered merge collector. Dyno testing showed up to +11 HP and +15 lb-ft TQ. Some cutting is required; made in Corona, California.
aFe MACHForce XP 3in to 2.5in 304 SS Axle-Back Exhaust w/ Black Tips 14-16 BMW M235i