ARM Motorsports S55 J Pipe - F80 M3 | F82/F83 M4 | F87 M2CHIGHLIGHTS FULL T6061 ALUMINUM CONSTRUCTION SECURED THROTTLE BODY CONNECTION 2X METHANOL NITROUS PORTS DIRECT FIT PROFILE Complete 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