K&N Custom Air Filter Assemblies are designed with the racer in mind. They incorporate good looks as well as the superior air flow that you expect from K&N. K&N Custom Air Filter Assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air Filters and provide more air flow than other assemblies of this type. Available in 4 different designs, the perfect assembly is sure to be found here. Each complete assembly comes with base, element, and top plate.
K&N Custom Air Filter Assemblies are designed with the racer in mind. They incorporate good looks as well as the superior air flow that you expect from K&N. K&N Custom Air Filter Assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air Filters and provide more air flow than other assemblies of this type. Available in 4 different designs, the perfect assembly is sure to be found here. Each complete assembly comes with base, element, and top plate.
in 1 offers
The lowest price for K&N E-3973 Round Air Filter 16.25" OD right now is $110,000.00 at Rolan Australia.
The all-time low was $110,000.00 on 31 Dec 2025. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 13 May 2026.
K&N E-3973 Round Air Filter 16.25" OD
K&N Custom Air Filter Assemblies are designed with the racer in mind. They incorporate good looks as well as the superior air flow that you expect from K&N. K&N Custom Air Filter Assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air Filters and provide more air flow than other assemblies of this type. Available in 4 different designs, the perfect assembly is sure to be found here. Each complete assembly comes with base, element, and top plate.
K&N Custom Air Filter Assemblies are designed with the racer in mind. They incorporate good looks as well as the superior air flow that you expect from K&N. K&N Custom Air Filter Assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air Filters and provide more air flow than other assemblies of this type. Available in 4 different designs, the perfect assembly is sure to be found here. Each complete assembly comes with base, element, and top plate.
Last updated at 13/05/2026 23:01:25
K&N Round Air Filter (E-3973)
Delivery $8.80
| Air Filter Material | Cotton Gauze |
| Air Filter Shape | Round |
| Product Style | Round Air Filter |
| Product Box Width | 18.38 in (467 mm) |
K&N Round Air Filter (E-3973)
Delivery $8.80
| Air Filter Material | Cotton Gauze |
| Air Filter Shape | Round |
| Product Style | Round Air Filter |
| Product Box Width | 18.38 in (467 mm) |
