Chrome plated billet aluminum. The Ness Monster Sucker air cleaner comes with the largest filter surface area of all aftermarket 90ř air cleaners; which translates to: ''The best breathing 90ř air cleaner on the market!'' It allows this filter to keep-up with air-demands from bone stock all the way up to massive horsepower spitting engines. Filter elements are constructed from water-resistant synthetic material. After cleaning; just rinse and do not oil. Rain socks are usually no longer required either. The aluminum body is manufactured from precision forged billet aluminum and CNC machined to the Ness standard where perfection is absolute. Hidden patented internal breathers are used to provide efficient breathing combined with the cleanest looks. Note: An optional rain sock is separately available as 590443; for when riding in adverse weather conditions.

Chrome plated billet aluminum. The Ness Monster Sucker air cleaner comes with the largest filter surface area of all aftermarket 90ř air cleaners; which translates to: ''The best breathing 90ř air cleaner on the market!'' It allows this filter to keep-up with air-demands from bone stock all the way up to massive horsepower spitting engines. Filter elements are constructed from water-resistant synthetic material. After cleaning; just rinse and do not oil. Rain socks are usually no longer required either. The aluminum body is manufactured from precision forged billet aluminum and CNC machined to the Ness standard where perfection is absolute. Hidden patented internal breathers are used to provide efficient breathing combined with the cleanest looks. Note: An optional rain sock is separately available as 590443; for when riding in adverse weather conditions.

- Plain backing plate - For use with the OEM round air cleaner cover - Stage 1 red pre-oiled filter element. The best and simplest performance air cleaner kit for your bike... period. Gain up to 21% horsepower by simply installing a Big SuckerT kit on your intake. Backing plates: The Big Sucker aluminum backing plates feature a radiused inlet to optimize airflow for both carburetor and fuel injection applications. The built-in breathing system features hidden channels to prevent the use of unsightly exposed breather hoses and fittings.

Slot Track black anodized outer cover. Black backing plate. Comes with an exposed performance synthetic black air cleaner element for good looks and excellent performance. Note: This synthetic black air filter element requires no oil. To service; just clean and rinse. Do not use oil.

Beveled black anodized billet outer cover. Black backing plate. Comes with an exposed performance synthetic black air cleaner element for good looks and excellent performance. Note: This synthetic black air filter element requires no oil. To service; just clean and rinse. Do not use oil.

Beveled outer chrome plated billet cover. Comes with an exposed performance synthetic black air cleaner element for good looks and excellent performance. Note: This synthetic black air filter element requires no oil. To service; just clean and rinse. Do not use oil.

- Black anodized one-piece aluminum backing plate - Used with OEM air cleaner cover with single central bolt (excl. 14-16 Touring) - Can be used as an exposed filter design when using one of the Ness Stage1 billet covers - Increases horsepower & torque - Built-in patented breathing system features hidden channels to prevent the use of unsightly exposed breather hoses and fittings - Radius air inlet for unobstructed airflow Note: 14-16 Touring is not compatible with the OEM cover but requires an exposed filter design and is compatible with one of the Ness Stage1 billet covers

- Plain finish one-piece aluminum backing plate - Used with OEM air cleaner cover with single central bolt - Can be used as an exposed filter design when using one of the Ness Stage1 billet covers - Increases horsepower & torque - Built-in patented breathing system features hidden channels to prevent the use of unsightly exposed breather hoses and fittings - Radius air inlet for unobstructed airflow

- Plain finish one-piece aluminum backing plate - Used with OEM air cleaner cover with single central bolt - Can be used as an exposed filter design when using one of the Ness Stage1 billet covers - Increases horsepower & torque - Built-in patented breathing system features hidden channels to prevent the use of unsightly exposed breather hoses and fittings - Radius air inlet for unobstructed airflow

- Chrome plated one-piece aluminum backing plate - Used with a custom round air cleaner cover; minimum ID 6-1/4" - Increases horsepower & torque - Built-in patented breathing system features hidden channels to prevent the use of unsightly exposed breather hoses and fittings - Radius air inlet for unobstructed airflow

With Scalloped Black anodized billet cover. The exposed air filter element gives it good looks and excellent breathing capabilities. - This air cleaner assembly comes with Ness'' synthetic; stainless steel jacketed filter element equipped with synthetic filter media. This high performance filter is water-resistant and does not require filter oil. To service; just clean; rinse and re-install. - Replacement air filter elements 959593 (black synthetic filter; requires no oil) / 959597 (4-layer cotton gauge pre-oiled) - Optional rain sock 595629