BMW F87 M2C, F80 M3, F82 F83 M4 S55 J Pipe - ARM MotorsportsComplete your S55 upgraded charge piping with the ARM S55 J Pipe! This J Pipe is the final piece of piping on the S55 before the charge air enters the intake manifold. BMW constructed the OEM J Pipe of plastic which is prone to cracking an detaching from the throttle body under boost. The ARM S55 J Pipe is constructed of T6061 aluminum for a durable replacement that will hold up to even the most demanding builds. HIGHLIGHTS FULL T6061 ALUMINUM