
aFe Twisted Steel Catted Downpipe SS-304 12-16 BMW 328i/428i (F30/F32) L4 2.0L (t) N20
Testing: In testing, the down-pipes produced a max gain of +13 horsepower and +29 ft. lbs. of torque verified by our in house dyno *(Dyno results are from P/N: 48-46303-HN) High Flow Catalytic Converter: This down-pipe utilize a 400 CPSI (cell per square inch) catalytic converters for maximum flow. Factory Mounting Locations: The down-pipe mount directly to fact ory mounting locations and includes hardware for a hassle-free installation. Tapered Design: A unique 4" tapered design is used to increase exhaust velocity and increase usable torque. This means more aggressive throttle response and increased passing power. Factory Style Connections: Machined, factory style flanges are used for a secure leak-free seal. TIG-Welded: 100% TIG-Welded by certified craftsmen for race proven strength and durability. TIG-Welding provides the strongest welds reducing stress cracks. Brushed 304 SS Construction: This down-pipe are constructed of 4" mandrel-bent, brushed 304 stainless steel tubing for max