- Chrome plated one-piece billet aluminum backing plate - Scalloped chrome plated billet outer cover - Not compatible with OEM outer air cleaner covers - Stage II Big Suckers feature a 20% larger filtration area than the Stage I kits - Comes with a high performance synthetic filter with a zinc plated housing - Filter requires no oil; just clean; rinse and re-install when servicing - 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 one-piece billet aluminum backing plate - Smooth chrome steel outer cover - Not compatible with OEM outer air cleaner covers - Stage II Big Suckers feature a 20% larger filtration area than the Stage I kits - Comes with a high performance synthetic filter with a zinc plated housing - Filter requires no oil; just clean; rinse and re-install when servicing - 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.

- Black anodized one-piece billet aluminum backing plate - Smooth black powder coated steel outer cover - Not compatible with OEM outer air cleaner covers - Stage II Big Suckers feature a 20% larger filtration area than the Stage I kits - Comes with a high performance synthetic filter with a zinc plated housing - Filter requires no oil; just clean; rinse and re-install when servicing - 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 billet aluminum backing plate - Without end cover - Takes any 5-hole Twin Cam derby cover as end cover. This ''Derby-Sucker'' will take any stock or custom Twin Cam 5-hole derby cover as outer cover; giving styling virtually endless options. The best and simplest performance air cleaner kit for your bike... period. Gain up to 21% horsepower by simply installing a Derby SuckerT kit on your intake. The Derby Sucker aluminum one-piece backing plate features a radiused inlet to optimize airflow. The built-in breathing system features hidden channels to prevent the use of unsightly exposed breather hoses and fittings. Note: See 959805 for the replacement air filter element. Note: An optional rain sock is not available for Derby Sucker air cleaner kits.

- Plain backing plate - For use with the OEM oval 2-bolt 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. Note: See 958900 for the replacement filter element only.

- Inverted top plate with pleated side to maximize airflow - Black synthetic high performance air filter element with built-in velocity stack - To service; just clean and rinse filter element - Do not oil filter element - Offers increased leg room - Complete with installation hardware and gaskets. Note: See 590442 for optional rain sock. See 960388 for the replacement air filter element

- Inverted top plate with pleated side to maximize airflow - Black synthetic high performance air filter element with built-in velocity stack - To service; just clean and rinse filter element - Do not oil filter element - Offers increased leg room - Complete with installation hardware and gaskets. Note: See 590442 for optional rain sock. See 960388 for the replacement air filter element

- Black anodized with a Contrast Cut machined finish - Inverted top plate with pleated side to maximize airflow - Black synthetic high performance air filter element with built-in velocity stack - To service; just clean and rinse filter element - Do not oil filter element - Offers increased leg room - Complete with installation hardware and gaskets. Note: See 590442 for optional rain sock. See 960388 for the replacement air filter element

Black anodized 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 590445; for when riding in adverse weather conditions.

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. Note: See 959594 for the replacement filter element.