This K&N Pod Filter has a 3" inlet and is 6.5" in length. It is very similer to the K&N air Filter RE-0930 In take filter. Only difference is physical shape preference and that this filter is half an inch longer.

K&N RU-2820 Product Specifications
Flange Inside Diameter: 3 in (76 mm)
Flange Length: 0.625 in (16 mm)
Flange Type: Centered
Height: 6.5 in (165 mm)
Outside Diameter: 5 in (127 mm)
Top Style: Rubber
Top Material/Finish: None
Filter Material: Cotton Gauze
Flanges: 1
Filter Re-Oiling Amount: 1.15 oz (34 ml)
Inner Wire: No
Weight: 1.2 lb (0.5 kg)