B58 Charge Pipe For Gen 1 BMW M240I, 340i, 440i, 540i, 640i, 740i, X3, X4 - ARM MotorsportsThe ARM B58 Charge Pipe is a bulletproof charge pipe replacement for the plastic OEM B58 charge pipe. The ARM B58 Charge Pipe increases the diameter over the OEM charge pipe, resulting in increased airflow from the turbo to the engine, and improved throttle response. Upgrading the charge pipe on your B58 is one of the basic steps in ensuring your B58 is protected against a charge pipe failure. In addition to making sure you have a reliable means of