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Improve the performance of the Audi B7 A4 by upgrading the highly restrictive factory air intake system with a performance air intake. You will see a horsepower and torque gains after installing the free-flowing intake system. These simple to install performance upgrades are the perfect modifications to make for the first-time car enthusiasts for those with a lot of experience. We also carry direct OEM replacement drop-in filters for those who just need a new air filter for their Audi.