The aFe MACHForce XP 3" to 2.5" 304 stainless steel axle-back for 2014–2016 BMW M235i uses mandrel-bent tubing and a high-flow black stainless muffler with dual 4" polished tips. Measured dyno gains reached up to +11 HP and +15 lb-ft torque. The system uses factory-style hangers for fitment (some cutting required), includes a factory-style exhaust valve that uses the factory valve motor, and is fully MIG-welded.
aFe MACHForce XP 3in to 2.5in 304 SS Axle-Back Exhaust w/ Polished Tips 14-16 BMW M235i