K&N Universal Clamp-On Air Filter RU-4410

Fit and sizing

Drivers looking for a reusable filter for a compatible intake setup may find the K&N RU-4410 worth a closer look. It has a round tapered shape, a 3.5-inch flange diameter, a 3-inch filter height, and a 0.625-inch flange length. Those measurements matter more than the word “universal”: the filter is designed for a variety of applications, but the listing does not identify specific vehicles or intake systems.

Before buying, compare the flange and available clearance with your setup. A filter that attaches securely but crowds nearby components is still the wrong fit. Without having tried it, the useful takeaway is that the listed dimensions give you a starting point, not vehicle-specific confirmation.

Pros

The cotton-gauze media uses four layers treated with a tacking agent to capture contaminants, according to the product description. K&N also presents the filter as a reusable alternative to disposable filters, which may appeal if you would rather clean and maintain one part than replace a standard filter regularly.

It comes pre-oiled and is described as ready to install. The manufacturer says cleaning is needed every 75,000 miles under normal highway driving conditions, with five years based on an average of 15,000 miles per year. That interval is tied to those stated conditions, not a promise that every driving environment will require the same schedule.

K&N says the filter media is designed to support horsepower, acceleration, and overall engine performance. Those are intended benefits, not guaranteed gains for every vehicle, results depend on the application and setup. For a practical example, someone checking an intake before a weekend drive can compare the filter’s flange measurements with the intake opening, then check that its rounded body has room around it. If the setup matches, its washable construction offers a different maintenance approach from replacing disposable filters.

Spec sheet

• Name: K&N RU-4410
• Type: Universal clamp-on air filter
• Shape: Round tapered
• Flange diameter: 3.5 in
• Filter height: 3 in
• Flange length: 0.625 in
• Material: Cotton gauze media with four layers
• Maintenance: Cleaning interval listed as every 75,000 miles under normal highway driving conditions

Buying verdict

Worth considering if you want a washable air filter and can match its dimensions to a compatible intake. Its strongest practical case is reusable construction paired with a stated long cleaning interval for normal highway use. That makes it a different proposition from a basic disposable replacement, which is simpler to swap but is not reusable.

It’s not for you if you need confirmed fitment for a particular vehicle, have not checked the intake opening and available clearance, or want a filter with documented performance results for your exact setup. The product description does not provide vehicle-specific compatibility or quantified power gains. Choose it when the measurements and clamp-on format suit your intake, choose a confirmed-fit replacement instead when certainty matters more than a reusable design.