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To create more power on the Audi B8 A4 and S4, you need to maximize the airflow going to the engine with the use of a performance air intake system. By replacing the factory intake system with a cold air intake for the Audi B8 A4/S4, you are dramatically increasing the airflow going to the engine, resulting in increases in horsepower and torque. Installing a cold air intake system on the B8 A4/S4 is a simple installation and only requires basic hand tools. If you are just looking to replace the air filter in the factory intake system of the Audi B8 A4 and S4, we also carry the very best selection of performance drop-in replacement filters that provide maximum filtration for a subtle boost in engine response and power.