S&B 8ply Power Stack Air Filter - Black Rubber Cap, 4.00" Inlet, 8.00" Length, Red Element Item ID: SBPSR-400-800-RED Size (spec): 4.00" Material (spec): 8-Ply Cotton-gauze Dimensions (spec): 4.00" Outlet ID x 5.25" Cone OD x 8" Filter Height (spec): 8.00"