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’s cold air intakes embody European performance engineering—precision-crafted carbon-fiber airboxes, silicone plumbing, and high-flow filters designed to let your engine breathe freely, respond quicker, and deliver enhanced performance and induction sound on VW and Audi vehicles.