When a regular filter just won't do, turn to an aFe ProHDuty Filter. aFe ProHDuty Filter are heavy duty variants of aFe filters you trust; Pro 5R, Pro DryS and Pro-Guard 7. PartNumber : afe70-50028 Description : ProHDuty Filter Diameter Inside (in.) : OEM Filter Material : Cotton Gauze Shape : OEM Cap Outside Diameter : N/A Filter Style : Pre-Oiled Diameter Outside (in.) : OEM Height (in.) : OEM Overall Length (in.) : NA Width (in.) : NA Air Filters::Air Filters - Direct Fit