CTS Turbo Race 4" Downpipe BMW N55 (Electric Wastegate) X4 M40i

The CTS Turbo Race 4" Downpipe is purpose-built for BMW N55 engines equipped with electric wastegate control in the X4 M40i platform. This race-spec downpipe features a full 4-inch mandrel-bent design that dramatically reduces exhaust restriction compared to the factory unit. The larger diameter construction improves turbine efficiency and exhaust gas evacuation, supporting increased performance gains when paired with ECU tuning. Precision-engineered for the electric wastegate configuration, it ensures proper fitment and reliable operation under demanding conditions. Built from high-grade materials for durability in motorsport and high-performance street applications.