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Proper exhaust
In the milliseconds that the ambient air passes through the intercooler it warms up
• Exotic Exhaust Note
Wear it rolled down for maximum warmth or cuffed higher for a sleek
BMW F8X M3 M4 S55 J PIPE f21 Proper exhaustHIGHLIGHTS 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