S55 Silicone Charge Pipe For BMW F87 M2C, F80 M3, F82 F83 M4 - ARM Motorsports Valente Van Here is link for :

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Center Bore: 57

What this means is that your OEM PCV system is not up to the task of the performance you are subjecting it to

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Full kit is shown above

S55 Silicone Charge Pipe For BMW F87 M2C, F80 M3, F82 F83 M4 - ARM Motorsports Valente Van Here is link for :The ARM S55 Silicone Charge Pipes allow you to maximize power on your S55 powered BMW by replacing the OEM charge pipes which are known for cracking and leaking boost. Silicone charge pipes benefit the S55 engine over their aluminum counterparts by providing an extra layer of insulation. Aluminum charge pipes conduct heat more easily between the engine bay and the charge air going from the S55's turbos to the intercooler, while silicone charge pipes