The K&N RU-3135HBK is a Dryflow universal clamp-on air filter with a round tapered shape and black, oil-free synthetic media. The manufacturer describes it as a low-restriction filter for a wide range of applications, and it is rated up to 99% filtration efficiency. Because the media is oil-free, it avoids the sticky oil film of oiled filters, and the synthetic material can be washed and reused instead of being thrown away like a disposable paper element. That makes it a practical choice for a buyer who wants a 5 in flange universal intake filter for a track car, off-road build, or utility engine without recurring filter purchases.
Fitment is universal, so the job is matching the intake, not the vehicle. Measure the intake tube before ordering: this filter has a 5 in inside flange diameter, a 1 in flange length, a 6.5 in base outside diameter, and a 4.375 in top outside diameter, with a 7 in overall height. The manufacturer's website offers a search by dimensions, which helps when confirming a fit. Installation is a clamp-on job: slide the rubber flange onto the intake tube, tighten the integrated clamp, and check for air leaks at the seal. Keywords: 5 inch flange universal air filter, oil-free synthetic clamp-on intake filter, round tapered 6.5 inch base air filter, washable reusable K&N universal filter.
No. The manufacturer states this filter is built from Dryflow oil-free synthetic media, so it is used dry. Only the cleaning step requires a product: the manufacturer specifies K&N synthetic air filter cleaner.
This is a universal filter, so fit depends on the intake tube rather than a specific vehicle. Confirm the inside diameter of the intake tube matches the 5 in flange, then check the 6.5 in base and 7 in height against your available clearance. The manufacturer's dimension search tool can help confirm the match.
The manufacturer lists a 1 Year Limited warranty for this part.
This is a simple, tool-free clamp-on installation. Loosen the factory intake clamp, slide the rubber flange onto the intake tube, and tighten the integrated clamp until the filter is firmly seated. Check the seal by confirming there are no gaps around the flange and no loose connections, since an air leak can bypass the filter. To clean it later, wash the filter with K&N synthetic air filter cleaner, let it dry fully, and reinstall it. Detailed step-by-step instructions specific to this MPN were not located during research, so confirm sizing before ordering.
