The K&N RU-1027 is a round tapered universal clamp-on air filter with a 4 in flange, a 6.5 in base, a 4.5 in top, and an 8 in height. The Multiple layers of premium cotton gauze treated with a specially-designed tacking agent form a reusable oiled element, and the manufacturer rates it at Up To 99% Efficiency. Its rubber top and flexible frame help it seal to a range of intake tubes, which makes it a practical choice for custom intake builds, off-road rigs, and older vehicles where a stock box filter no longer fits the plumbing.
The main case for this filter over a stock or disposable paper element is reuse. The element is washable, so you can clean and re-oil it instead of replacing it, and the manufacturer's universal-filter guidance points to cleaning about every 75,000 miles under normal highway driving. Oil is included, and the manufacturer lists a 2.19 oz (65 ml) re-oiling amount for each service. The one-year limited warranty adds some protection. Because the flange can stretch up to 1/16 in to fit between sizes, you can also cover a small sizing gap. Confirm the flange fit before ordering, because the flange is the dimension that decides whether the filter seals.
This is a universal clamp-on filter, so fitment depends on the intake flange rather than a vehicle list. The manufacturer lists a 4 in flange inside diameter, and its universal filter flanges can stretch up to 1/16 in to fit between sizes. Check your intake tube's flange diameter against these figures before ordering.
Yes. The manufacturer describes K&N universal filters as washable and reusable. Its universal-filter guidance points to cleaning about every 75,000 miles under normal highway driving, and the element should be re-oiled after each cleaning using the 2.19 oz (65 ml) amount the manufacturer specifies.
Yes. The manufacturer's specifications list oil as included, so the filter arrives pre-oiled and ready to install.
The manufacturer lists this filter at an easy DIY level, with a typical install time of 5 to 10 minutes and a screwdriver as the main tool. Start by loosening the hose clamp on the intake tube and removing the old filter. Slide the RU-1027 flange onto the intake, center it, and tighten the clamp evenly without overtightening. Per the manufacturer's general K&N install hints, some K&N filters go into the air box lid first, so hold the filter in place while you reinstall the lid. Expect slightly more clamp pressure than with a soft foam OEM seal, and if the lid will not seat easily or the air box bends, stop and recheck the alignment rather than forcing it.
