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

Donaldson

Ultra-Web Primary Air Filter

$98.55

SKU: 6637

In Stock
In Stock
Ships by Aug 4
Free Shipping over $100
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Description

The Donaldson Blue 6637 air filter utilizes exclusive Ultra-Web nanofiber technology to offer superior engine protection and longevity compared to conventional cellulose media. Donaldson, a pioneer in heavy-duty diesel engine air filters for over a century, developed this advanced nanofiber media to provide exceptional performance and durability. This filter boasts a significant 37% increase in airflow over standard 6637 cellulose filters, achieving a flow rate exceeding 1300 CFM+. This enhanced flow contributes to better engine efficiency and performance. For on-road use, it is guaranteed to last twice as long as standard cellulose filters. The Donaldson 6637 is a disposable filter and is not washable. It is 100% Made in the USA.

MIA's Description

The Donaldson 6637 is a primary air filter designed with Ultra-Web nanofiber technology. This technology provides better engine protection by allowing less contaminant to pass through while maintaining a high flow rate. It offers a 37% increase in flow over standard 6637 cellulose filters and has been tested to flow over 1300 CFM+.

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

BrandDonaldson
Part Number6637
CategoryAir and Fuel

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.

View Full Return Policy