3.5" K&N air filter 89 mm – Clamp-on – up to 375 hp – RU-3550
K&N RU-3550 is an open clamp-on air filter for universal solutions where you want a simple and effective installation directly on the airflow meter, intake pipe, or turbo inlet with an 89 mm connection. The filter is suitable for both road cars and performance projects where good airflow, washable filter media, and the well-known K&N quality are desired. The conical design provides a compact solution with good filter surface area, making it ideal for conversions where space in the engine bay is limited.
K&N RU-3550 is made as a washable and reusable cotton gauze filter, so it can be cleaned and reused instead of being discarded. This makes it a practical solution for vehicles that cover many kilometres or where higher demands are placed on the intake system. With an 89 mm flange, it fits a 3.5" connection, and the tapered shape makes it easier to fit the filter into many custom builds and motorsport projects. According to the product designation, it is often used for setups around 375 hp, but actual capacity will always depend on the complete intake setup, available space, and the rest of the engine configuration.
Specifications
Part number: RU-3550
Type: K&N clamp-on air filter
Connection / flange inner diameter: 3.5" (89 mm)
Filter height: 5.5" (140 mm)
Flange length: 0.625" (16 mm)
Base outside diameter: 4.625" (117 mm)
Top outside diameter: 3.5" (89 mm)
Shape: Round conical / tapered
Flange type: Centered
Material: Cotton gauze
Colour: Red
Top style: Rubber
Number of flanges: 1
Washable: Yes
You can advantageously buy a K&N filter cleaning kit - Gives your air filter a longer life and keeps the effect up.
