The K&N RU-9410 is a round-tapered, clamp-on replacement intake filter from K&N's High-Flow Original universal line, measuring 3"FLG, 4-1/2"B, 3-1/2"T, 4-3/8"H. Its cotton gauze element uses several layers treated with a tacking agent to trap contaminants, and the manufacturer rates it at up to 99% efficiency. Its reusable construction makes it a practical alternative to disposable paper elements, since the same filter can be cleaned and re-oiled instead of replaced at every service interval.
Because this is a universal filter, it is not a direct-fit part. The manufacturer says it is designed for use on a variety of applications, so the purchase decision should start with measuring the flange, base, top, and height of your existing intake tube or air box opening. The manufacturer's marketing also describes the element as a way to increase horsepower and acceleration, but no dyno-verified gain for this specific part was confirmed in our research. Buyers searching for a 3 inch flange universal K&N filter, a round tapered cotton gauze replacement element, or a reusable high-flow intake filter for a custom intake will find this size fits that brief.
The manufacturer lists this as a universal filter designed for a variety of applications rather than a vehicle-specific part. Confirm that the 3 inch flange and the base, top, and height dimensions match your intake before ordering.
The manufacturer states that K&N air filters are pre-oiled and ready for use. The manufacturer also lists a re-oiling amount of 0.47 oz (14 ml) for this part when it is cleaned and oiled again.
Installation is a clamp-on swap: measure the intake opening first, slide the rubber flange onto the tube, and secure it with your existing clamp. When it is time to service the filter, the manufacturer's light-duty cleaning sheet describes removing the element, tapping off loose debris, spraying K&N cleaner on both sides, rinsing from the clean side out, and letting it dry before reinstalling. Confirm the exact cleaning and re-oiling procedure for this cotton gauze element with the manufacturer before the first service, and do not use compressed air or heat to dry it.
