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![Boost Horsepower | K & N Filters Air Filter for Audi A4 Quattro, RS4, S4 | Washable Red Cotton Gauze Boost Horsepower | K & N Filters Air Filter for Audi A4 Quattro, RS4, S4 | Washable Red Cotton Gauze](https://cdn11.bigcommerce.com/s-ywvojiobs6/images/stencil/300x300/products/139093/271635/33-2209_1__81031.1678032670.jpg?c=1)
Boost Horsepower | K & N Filters Air Filter for Audi A4 Quattro, RS4, S4 | Washable Red Cotton Gauze
K & N Filters
$120.51
$100.16
![](https://cdn11.bigcommerce.com/s-ywvojiobs6/product_images/u/apijib1md__45770.png")
Note: Air Filter, Red, Cotton Gauze, Round Tapered, 6 Inch Base Outside Diameter x 5 Inch Top Outside Diameter x 6 Inch Height, 3 Inch Flange Inside Diameter x 1-3/4 Inch Flange Length, Black Carbon Fiber Top