ARLEN NESS Monster Air Cleaner - Black 81-039

The ARLEN NESS Monster Air Cleaner delivers measurable gains in engine breathing efficiency through its patented hidden breather technology and expanded filter surface area. By eliminating external hoses and routing air intake directly through the injector or carb mouth, this kit reduces restriction while maintaining a clean, integrated appearance. The inverted filter design pulls air from all directions, maximizing volumetric efficiency for engines that demand uncompromised airflow.

Built for durability and ease of maintenance, the synthetic filter resists water ingestion in most conditions and requires only a simple rinse-and-reuse cleaning cycle—no oil treatments necessary. If you want to upgrade the visual impact later, forged billet covers are available separately to customize your setup without replacing the core kit.

• Patented hidden breather technology
• O-ringed head connections
• Inverted filter design
• Synthetic, water-resistant material
• Reusable filter element
• No external hoses required
• No oil treatment needed
• Forged billet covers optional
• Universal fitment application
• Bolt-on installation
• MPN: 81-039