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The BMW M Performance Power and Sound Kit provides an optimized power boost (+35hp) for the series engine in the 340i/340i xDrive. The new, performance-optimized engine update, coupled with the perfectly-tuned valve silencer system make the 340i/440i and 340i/440i xDrive an uncompromising sport experience for all the senses.Power and sound kit
Fits 340i, 440i