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CTS Turbo B5 S4 MAF housing adapter for 85mm HF4T-0N04-L Installation Is A Snap: This**Free Shipping for Online Orders** \nCTS Turbo is proud to release our MAF Housing adapter for B5 S4 and CTS 85mm MAF housing. Our MAF housing adapter is designed for seamless integration into your existing intake tract. Using the factory S4 airbox you can count on smoother power and more consistent MAF readings.