Washable cotton-gauze engine air filters for the factory airboxes. Package contains two filters; this price is for the pair.
Manufacturer-listed BMW applications: Manufacturer-confirmed example: 2015 BMW M4 3.0L L6, all models. Also listed for select BMW M3, M5 and M6 applications; verify exact vehicle and engine in the manufacturer's selector before ordering. 
Manufacturer part number: 33-2488.
Manufacturer specifications and fitment
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