These power filters from DNA are as good as K&Ns, but their price is a bit lower.

The filters are priced per piece. So, if you want your Custom to go faster, go for DNA!

Specifications:

• Part Number: OVI-5404
• Design: Special Top
• ID: 54 mm
• Length: 87 mm
• Outside Diameter Big: 100 x 75 mm
• Outside Diameter Small: 67 x 52 mm
• Flange: 19 mm
• Top Style: Rubber top

The filters are also washable. Oil them in and you are ready for the road again! You can also drive through the rain when it's oiled in.