The K&N RU-1048XD is a round tapered, clamp-on replacement filter with a 6-inch flange, 7-1/2-inch base, 4-1/2-inch top, and 6-inch height. It uses cotton gauze media from K&N's High-Flow universal line. The manufacturer says universal filters are meant to suit intakes regardless of the angle or offset diameter, which makes this a practical pick for custom intake tubes, track builds, and non-stock induction setups where no direct-fit filter exists.
Compared with a disposable paper element, the value here is reuse. K&N universal filters are washable and reusable, so the cost spreads across the life of the vehicle instead of recurring at every service. Each filter has a molded rubber flange that is designed to dampen vibration and grip the intake securely, and the flange can be stretched up to 1/16 inch (1.5 mm) to fit in between sizes. Searches for a 6 inch flange washable cotton gauze air filter or a round tapered clamp-on filter for a track car often lead to this kind of universal cone.
This is a universal clamp-on filter, not a vehicle-specific part. The manufacturer designs these around intake dimensions rather than a make or model, so match the 6-inch flange to your intake's outside diameter. The flange can stretch up to 1/16 inch to bridge small size gaps, but it is not meant to cover a large mismatch.
Per the manufacturer, K&N air filters are pre-oiled and ready to use out of the box. Details on re-oiling after cleaning vary, so confirm the correct re-oil product and amount with the manufacturer before your first service.
This is a drop-in, clamp-on filter, and the manufacturer describes K&N filters as easy to install. Measure your intake's outside diameter before ordering, because the flange only stretches about 1/16 inch. Dry-fit the flange against the intake before final assembly to check the seal, and make sure the filter sits clear of any sensor or hose. Tool requirements for this exact part were not confirmed in the manufacturer documentation I reviewed, so follow the manufacturer's installation guidance for your setup.
