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

Specifications:

• Part Number: OV-5104
• Design: Oval
• ID: 51 mm
• Length: 87 mm
• Outside Diameter Big: 100 x 75 mm
• Outside Diameter Small: 75 x 50 mm
• Flange: 16 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.

for:

Kawasaki
GPZ 500 84-88
GTR 1000 92-03
KZ 550 GP 82-83
GPX 750 R 87-89
GPZ 600 R Ninja 85-99
Z 550 GP 82-83
ZC 1000 Concours 86-03
ZL 600 Eliminator 86-97

Suzuki
GSX 600 F 88-89
GSX 1100 F 88-96
Katana 88-93
GSX-R 750 86-87
GSX-R 1100 86-92

Yamaha
FJ 600 84-85
FZ 600 86-88
FZR 400 88-90
FZX 700 86-87
FZR 750 R Genesis 88
XJ 900 F 83-94
XJ 600 N 84-01
Yamaha XJ 600 Diversion 92-03
XJ 650 Maxim 80-84
XJ 750 Maxim 82-83
XJ 700 Maxim 86
XJ 650 L Midnight 81
Xj 750 M Maxim Midnight 83
XJ 750 R Seca 81-83
XJ 900 R Seca 83
XJ600 S Seca 2 92-94
Xj 700 X Maxim 85-86
YX 600 Radian 88-90