Manufacturer: Walker Products. Fits: 1984-1995 Audi, BMW, and Volkswagen models including 4000 Quattro, 90, Coupe, S4, V8 Quattro, 524td, 530i, 535i and more — 2.2L, 2.3L, and 3.6L engines. Enables ECM to protect engine from overheating and improve cold starts.
