ECOGARD XA5457 Premium Engine Air Filter Fits 2002-2009 Audi A4 Quattro, A4 COMPATIBLE with 2002-2009 Audi A4 Quattro, 2002-2009 Audi A4. IMPROVE PERFORMANCE by changing your vehicle's air filter at least every 12,000 miles (or as recommended in your car owner's manual); to ensure your vehicle's engine has the clean and efficient air flow it needs for fast acceleration and long term power. AVOID INCREASED ENGINE WEAR caused by dirty air intake filters that may allow damaging particles to get into the engine. FACTORY FIT FOR EASY INSTALLATION. Replaces: FRAM CA9409 Purolator A45457 WIX 42972 OE 06C 133 843. SPECIFICALLY ENGINEERED AND TESTED for Audi OE (original equipment) engine air filter's fit, form, and function.