The K&N RP-5103 is an oval straight, clamp-on high-flow replacement filter built on oiled cotton filter media, and it uses a carbon fiber top and base for its housing. The manufacturer says carbon fiber provides 1/3 less weight than conventional filter top construction material, which helps the filter stay light at the intake. Compared with a stock paper element, this filter is washable and reusable, so you clean and re-oil it instead of buying a new filter each service. Its flanges absorb vibration and can be stretched up to 1/16 in. to fit in-between sizes. Keywords: K&N RP-5103 oval air filter, carbon fiber universal air filter, washable cotton gauze intake filter, 3-7/8 inch flange clamp-on filter.
Because this is a universal-fit part, confirm the application in the manufacturer's current catalog before ordering. Owners on user forums say the most common DIY mistake is over-oiling, and forum advice is to re-oil the cotton without saturating it. For installation, clean the air box housing and sealing surface, then make sure the filter seats flush so unfiltered air cannot bypass the media. The manufacturer's re-oil guidance is to let the oil wick for about 20 minutes and then touch up light spots until the media shows an even red color. The one-year limited warranty covers the filter itself.
It is sold as a universal-fit filter, and the manufacturer says it is designed for a variety of applications. The manufacturer's catalog lists specific applications, so check the current catalog for your vehicle before ordering.
According to the manufacturer, carbon fiber is about one-third lighter than conventional filter top materials while still providing strength. The top is a looks-and-weight upgrade rather than a change to the cotton filter media.
The manufacturer lists a re-oiling amount of 1.7 oz (50 ml). Apply the oil evenly along the pleats, let it wick for about 20 minutes, then touch up any light areas.
This is a clamp-on filter, so installation is a basic air box or intake job that needs no modifications. Loosen the air box clamps or lid fasteners, remove the stock element, and wipe out any dirt in the housing. Set the RP-5103 so the flange sits centered, then close the lid without forcing it. Owners on user forums warn that a poorly seated filter or an over-tightened lid can crack the air box. Check the filter's seal around the full perimeter before you finish. Clean and re-oil the filter before the first install if it arrives dry, and keep the oil light.
