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I've been trying to figure out how to do that for years.
I've seen but don't like a modified 997 m/c installed and the only other option is to t/p a complete brake booster/pump setup from a C4
Bill,
Is the reason for not being able to use the factory Turbo 25mm M/C because the mounting tab is missing on the 25mm M/C compared to the vac booster mounted 23mmM/C?