The K&N RE-0860 is a round tapered universal air filter with a red, oiled cotton gauze element and a molded rubber flange that clamps onto a 4-inch intake. The manufacturer positions its universal filters for racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Its 6-inch base and 12-inch overall height are the dimensions to check against your engine bay clearance before ordering.
Unlike a disposable paper element, this filter is meant to be cleaned and re-oiled, and the K&N universal air filters are washable and reusable. The rubber flange helps absorb vibration, and it can be stretched for up to 1/16 in. (1.5mm) to fit in-between sizes. The manufacturer markets the design for horsepower and acceleration gains, but no dyno figure was confirmed, so judge this part on filtration, reusability, and fit rather than a specific power number.
Owners looking for a 4 inch clamp-on K&N universal filter for a motorsport intake, pod-style setup, or tractor should confirm the flange ID and length match their intake tube. Fitment is a clamp-and-seat job, but user forums report that clamp-on K&N filters sometimes need hard shoving and some distortion to clear frame members, so dry-fit the filter before final tightening. Keep a K&N cleaning and oil kit on hand for re-oiling intervals.
Yes. The manufacturer states the filter is washable and reusable. Its cleaning guidance is to rinse with cool, low-pressure water from the clean side out, let it dry naturally, and apply oil only after it is completely dry.
The manufacturer says the rubber flange can be stretched up to 1/16 inch (1.5 mm) to fit in-between sizes. Anything beyond that range is not covered by that spec, so confirm your intake diameter first.
The manufacturer lists a re-oiling amount of 2.55 oz (76 ml).
No special tools are needed beyond a clamp and basic hand tools. Before fitting, clean the sealing surfaces and confirm the flange sits square on the intake tube. Per the manufacturer's cleaning guidance, avoid compressed air, gasoline, steam cleaning, and high-pressure washes when servicing the element. Re-oil only after the filter is fully dry. On tight installs, user forums suggest dry-fitting first, since clamp-on filters can need firm seating to clear frame members. Confirm the filter is not rubbing against hoses, wiring, or the frame once it is clamped in place.
