aFe Power 51-73114 Momentum GT Pro-DRY S Stage-2 Intake System Oil-Free Pro DRY S Filter, 3-Layers Of Progressively Finer Porosity Synthetic Media, Washable & Reusable Large 9" Tall Conical Inverted Top Filter, Unique (Patent Pending) Housing-to-Filter Interface, Roto-molded Intake Tube Built-in Sight Window Provides Easy Inspection Of Filter, Stainless Steel T-Bolt Clamp, No cutting or drilling