BMC is the premier air filter manufacturer, which makes them a perfect fit for your Audi S4. BMC air filters are designed specifically for your Audi, and will be an exact fit for your air box. A drop in performance filter is the perfect way to get performance gains for your S4 without modifying the engine. Add a high performance BMC air filter and unleash your vehicle’s potential.
Since 1990, BMC has been creating the best air filters on the market. With industry experience and a championship pedigree, BMC has become the standard for enthusiasts. Find the filter that fits your Audi S4 at the best price available. Select your S4’s trim.