Dinan high-flow drop-in replacement air filter for the stock air box of the N55 F-chassis cars: 2012-2016 335i / 435i and 2014-2018 M235i / M2 (F22/F23/F30/F31/F34/F32/F33/F36/F87). 4 layers of oiled cotton gauze - better flow and less pressure drop than the paper filter, washable and reusable. 267 x 212mm; replaces OEM 13717602643 / 13718616909.