Bolt-On Universal Air Filter Part No.: 18-207 (FIR - Factory Image Racing) Compatibility: Designed for ATVs, quads, dirt bikes, motorcycles, scooters, and go-carts with a 35mm manifold carburetor inlet. Ideal for both 2-stroke and 4-stroke engines. Specifications: Filter Dimensions: Diameter 74mm (top) / 51mm (base), Length 62mm Overall Length: 82mm (with rubber) Manifold Bore: 35mm ID with a flexible rubber flange that includes an adjustable clip, accommodating carburetor inlet variations up to +/- 2mm. Features: Performance Boost: Enhances airflow, contributing to increased engine power and efficiency. Reusable Design: The high-quality cotton filter element, housed in a fine mesh gauze, can be washed and reused without compromising filtration or performance. Chrome-Plated Steel End Cap: Adds durability and a sleek finish. Quick Installation: Flexible flange and adjustable clip ensure easy and secure installation. Quality Assurance: FIR-BRAND guarantees high-quality parts, tools, and accessories, all tested for reliability. Cross Reference: Compatible with K&N equivalent filters.