Wagner BMW B58 200CPSI Performance Downpipe (M140i, 440i, 540i & X4 M40ix)Wagner Tuning BMW B58 200CPSI Performance Downpipe is a stainless steel sports cat designed to increase airflow whilst complying with on road emissions regulations. Designed specifically for the B58 engine this downpipe reduces back pressure which improves throttle response and low mid range torque. The vehicle's exhaust note also benefits as this sports cat really allows the B58 engine to sing. The downpipe kit replaces the following stock BMW part:
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