aFe 2-1/2in 304 Stainless Steel Axle-Back Exhaust w/ Polished Tips | BMW 228i (14-16) (49-36346-P)Get increased exhaust flow, more horsepower and torque, improved performance and lower exhaust gas temperatures with the aFe Mach Force XP Axle Back Exhaust System. aFe dyno tests every system for maximum gains, and constructs them from mandrel bent stainless steel for maximum flow and long lasting durability. Features: Increases horsepower and torque Improves performance Lowers exhaust gas temperature Flow bench and dyno tested Welded hangers with