aFe Momentum HD Pro DRY S Replacement Air Filter – Part #21-91147

Restore peak airflow and protect your engine with the genuine aFe Power Momentum HD Pro DRY S replacement air filter (21-91147). This high-flow, oil-free filter is the direct-fit replacement for aFe Momentum and Momentum HD cold air intake systems.

Key Features & Benefits

• Pro DRY S Media — Three layers of progressive synthetic (dry) media deliver excellent filtration efficiency (99.2%) and strong dust-holding capacity without any oil. Maintenance is clean and simple—just wash and reuse.
• Deep, Open Pleats — Rounded, evenly spaced pleats maximize usable surface area for higher airflow, better filtration, and longer service intervals.
• Inverted Top Design — Increases filter surface area for extended life between cleanings.
• 100% Polyurethane Construction — Durable base and top maintain shape through heat cycles and provide a long service life.
• Molded-In Expanded Metal — Adds impact protection and structural strength.
• Pliable Polyurethane Flange — Progressive bump seal design creates a tight, leak-free fit that stays secure over time.

Specifications

• Flange ID: 5-1/2"
• Base: 8"
• Top: 8" (inverted)
• Height: 9"
• Media: Pro DRY S (oil-free synthetic)
• Washable & reusable
• Best suited for street and light off-road use
• Clean with aFe Power Cleaner (no oil required)

This filter is engineered as a direct replacement for aFe POWER Momentum intakes. It restores the performance and filtration of your intake system while offering the convenience of dry media—no mess, easy maintenance, and reliable protection for your engine.

Ideal for owners who want maximum convenience without sacrificing airflow or filtration quality.