Uni Two-Stage Competition Air Filter NU-8603ST | Arctic Cat ATV & UTV Models

UNI AIR FILTERS — Maximum Airflow & Ultimate Engine Protection

Upgrade your machine’s breathing with the Uni Filter NU-8603ST competition-grade dual-stage foam air filter. Designed to handle harsh trail dust and severe off-road conditions, Uni’s open-cell polyurethane foam captures dirt while maximizing airflow for optimal engine performance.

Key Features:

• Two-Stage Foam Protection: A coarse outer layer captures large debris and mud, while a fine inner layer stops tiny engine-damaging dust.

• Ultra-Seal Base: Features Uni's signature Ultra-Seal base with a built-in grease groove for a seamless seal against the factory airbox.

• Washable & Reusable: Easily service the dual layers separately—wash, re-oil, and reuse for maximum filter lifespan.

• Direct OEM Replacement: Engineered to fit directly into your stock airbox without modification.

• Made in the USA

Complete Vehicle Fitment List

Arctic Cat ATVs:

• 400 4x4 (Manual & Auto): 2005–2008

• 400 4x4 Auto TBX: 2005–2006

• 400 4x4 Auto TRV / TRV Plus: 2006–2010, 2013–2014

• 500 4x4 (Manual, Auto, LE & M4): 2005–2009

• 500 4x4 Auto TBX: 2005–2006

• 500 4x4 Auto TRV: 2005–2006, 2008

• 650 H1 4x4 Auto (Standard, LE, SE & TBX): 2005–2011

• 650 H1 4x4 Auto TRV / TRV Plus / TRV LE: 2007–2007

• 650 H1 4x4 Auto Mud Pro: 2010–2011

• 650 V-2 4x4 Auto (Standard, LE, TS & MRP): 2004–2006

Arctic Cat UTVs:

• Prowler 650 H1: 2006–2007

• Prowler XT 650 H1: 2006–2007

📦 Free Shipping!

We offer free shipping on all orders delivered within the lower 48 US states. (We do not ship to Alaska, Hawaii, or US Territories).