K&N Universal Air Filter 3 11/16in Flange x 8 3/4 x 5 1/2in Base x 6 3/8 x 3 3/16in Top x 7in Height - RP-5285 fits_2006-2011`Ford`Focus 0" design reduces backpressure for

0" design reduces backpressure for quicker throttle response

1981 Ford Mustang 2

Verify your spring seat is removable

Dual sealed housing blocks heat and contaminants

5 of additional camber and toe adjustment

K&N Universal Air Filter 3 11/16in Flange x 8 3/4 x 5 1/2in Base x 6 3/8 x 3 3/16in Top x 7in Height - RP-5285 fits_2006-2011`Ford`Focus 0" design reduces backpressure forThe RP 5285 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a K&N embossed carbon fiber top and carbon fiber base for strength and durability. The carbon fiber element adds to the light weight design and gives this filter a smooth glass like finish. The RP 5285 is a clamp on filter that has an inside flange diameter of 3 11 16 inches. The base is 8 3 4 inches by 5 1 2 inches and the filter height is 7 inches.