Mishimoto BMW N55 Charge Pipe (F2X F3X) 335i 435iThe N55 is a powerhouse, capable of producing over 600 horsepower on stock internals, but it has weak points. All that power requires almost 3x the boost the N55 was designed for. While the engine can handle it, your charge pipes may not be so strong. After over a decade, your BMW's stock charge pipes have become brittle and prone to catastrophic failure. Every time you press the throttle and hear that turbocharger spool is an invitation to the broken