K&N RU-1048XD X-Stream Round Tapered Universal Air Filter, 6in Flange

Vehicle Fitment

• Universal - not vehicle-specific; designed for a wide range of applications including racing vehicles, off-road competition, generators, snowmobiles, and tractors

Fitment Notes

• Clamp-on design fits carburetor or intake tubing matching the 6 in. flange diameter; rubber flange can stretch up to 1/16 in. to accommodate in-between sizes
• Not a direct factory drop-in for any specific make or model - match your intake tube's outside diameter to the filter's 6 in. flange before ordering

Features

• Four layers of premium cotton gauze treated with a specially designed tacking agent
• Intricate filter media mesh designed to block and trap harmful contaminants
• X-Stream round tapered (cone) design intended to maximize filter surface area and airflow
• Ultra-strong molded pliable rubber flange absorbs vibration for a secure attachment
• Flange can stretch up to 1/16 in. (1.5mm) to fit in-between sizes
• Washable and reusable, built for long-term durability
• Designed to increase horsepower and acceleration through improved airflow
• Suited to both track racing and off-road competition applications

Specifications

• Shape: Round Tapered / Conical
• Filter Material: Cotton gauze
• Flange (Inside) Diameter: 6 in.
• Base Outside Diameter: 7.5 in.
• Top Diameter: 4.5 in.
• Height: 6 in.
• Flange Type: Centered
• Re-Oiling Amount: 2.57 oz.
• Weight: Approximately 1.4 lbs.
• Fitment Type: Universal clamp-on

Included Components

• 1x K&N RU-1048XD X-Stream Universal Clamp-On Air Filter

Product Description

The K&N RU-1048XD is a large-format X-Stream universal air filter built with a 6 in. flange to fit directly onto a compatible intake tube rather than a single vehicle's factory air box. Its round tapered cone shape and 7.5 in. base diameter are designed to maximize filter surface area for strong, consistent airflow, making it a popular choice for track racing, off-road competition builds, and custom performance intakes.

Built from four layers of cotton gauze treated with K&N's tacking agent, the RU-1048XD is engineered to trap contaminants while supporting high airflow for a noticeable boost in horsepower and acceleration. The pliable rubber flange absorbs vibration for a secure hold and can stretch slightly to accommodate intake tubes that fall between standard sizes.

This filter is a strong fit for builders replacing the filter element on an existing 6 in. aftermarket intake system, whether for street performance, track use, or off-road competition. Because it's a clamp-on universal filter rather than a factory-specific part, confirm your intake tube's outside diameter matches the 6 in. flange before ordering, and clean using K&N's recharger kit to maintain filtration performance over its reusable lifespan.