The 2002-2005 Audi A4 quattro combines timeless Audi design, turbocharged performance, and legendary all-wheel-drive capability. Enhance your A4 quattro with APR performance upgrades, including ECU tuning, intake systems, exhaust upgrades, turbocharger enhancements, and supporting hardware engineered to increase power, improve responsiveness, and maximize driving enjoyment.

APR turbocharger systems represent the pinnacle of European-engineered performance—precision bolted solutions that unlock major power gains without compromise. With direct-bolt fitment, matched ECU calibration and high-flow hardware, you’ll elevate your vehicle’s potential, responsiveness and driving experience.