The K&N RU-4700 is a round tapered, clamp-on replacement intake filter built around K&N's reusable red cotton gauze element on a molded rubber top. The dimensions are a 3 in flange ID, 6 in base OD, 4 in top OD and 6.75 in height, so match them against your intake tube and airbox clearance before you buy. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes. Compared with a disposable paper element, this filter can be washed and re-oiled instead of replaced. K&N universal air filters are washable and reusable. Buyers looking for a reusable round tapered universal air filter, a 3 inch flange cotton gauze intake filter, or a 6.75 inch height clamp-on performance filter will find this size in the K&N line.
The manufacturer lists this filter with Overall Filter Efficiency · Up To 99% Efficiency, and describes it as designed to increase horsepower and acceleration. No measured horsepower gain is quoted in this description, so treat that claim as a design goal. Because it is a universal fit rather than a vehicle-specific part, the real-world value depends on whether the flange and base diameters suit your existing intake. Re-oiling is straightforward with the specified oil quantity of 1.21 oz (36 ml). Pick this part for a non-stock intake, an off-road or racing build, or a custom induction setup where a sealed clamp-on fit matters more than a plug-in OEM replacement.
No. The manufacturer categorizes it as a universal clamp-on air filter, not a filter built for a particular year, make or model. Confirm that the 3 in flange and 6 in base match your intake tube before ordering.
Per the manufacturer, the molded rubber flanges can be stretched up to 1/16 inch (1.5 mm) to fit in-between sizes.
The manufacturer specifies a re-oiling amount of 1.21 oz (36 ml). Check the manufacturer's care instructions for the recommended cleaning and re-oiling interval.
The manufacturer provides a 1-year limited warranty on this filter.
This is a clamp-on design, so the job centers on removing the stock filter and seating the rubber flange over the intake tube. Dry-fit the new filter before final tightening and check that the 6.75 in height clears the airbox lid and any nearby brackets. Owners on user forums, working on other applications, describe a lid that will not sit flat over a filter that is too thick, and warn that a deformed filter can let unfiltered air in. Confirm the required tools and any clamp hardware with the manufacturer's instructions, since a difficulty rating was not confirmed during research.
