K and N Yamaha Air Filters are specifically designed to make your vehicle run better and perform at a higher level. K&N Yamaha Air Filters are made with unique characteristics that separate them from the pack, and allow your vehicle to get better air filtration to boost your performance. K & N Yamaha Air Filters have advanced filtering capabilities and will dramatically increase the air to your engine, giving it more power and extending the life of your engine.
The Yamaha YZF R1 comes as close to off the track as possible while retaining its street legality
Replacement air filter specially designed for asphalt racing only
Two ply cotton media is designed to be less restrictive, providing a better racing advantage, for the 2009 Yamaha YZF R1’s 998cc liquid-cooled 4-stroke DOHC 16 valve engine
Designed to drop directly into the factory air box
Designed to increase horsepower and acceleration
K&N filters are made by hand in the United States and are constructed of the finest materials
K&N's replacement air filters, is washable and reusable
Warranted against defective workmanship for one year after the date of purchase with no mileage limitation
This K&N air filter is not intended for dirt track, off-road, or highway use
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This review is for K&N Performance Oil Filters - KN-204
Works - wilwrk4tls TN
Recommended by Reviewer: Yes
Pros: Fit just like it is supposed to, hex for socket
Cons: Slightly smaller volume of filter than OEM
I guess it is kind of hard to know right away, but the filter seems to be doing the trick. Fit just fine, no leaking, and it was nice to have the hex to install it with- the filter I removed did not and it was a hassle and a half to remove it.