Air and Fuel› Air Cleaners, Filters, Intakes and Components

K&N Engineering

K&N 18-21 Suzuki RMZ450 449 Replacement Air Filter

$136.99

SKU: K001 SU-4518XD

In Stock
In Stock
Ships by Jun 9
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Description

The K&N SU-4518XD is a powersport replacement air filter designed for enhanced performance. It features a large surface area for extended service life and offers low restriction for optimal airflow. This washable and reusable filter provides outstanding filtration.

It is ideal for use in dirty and dusty conditions, effectively keeping engines clear of dust and debris. The SU-4518XD is a direct-fit replacement that simplifies installation and removal, particularly for modern narrow-framed motocross bikes.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandK&N Engineering
Part NumberK001 SU-4518XD

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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