YFZ450 K & N filter?
#1
#7
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The ESR air filter kit has to run without an airbox. Ron Woods has one that you can use the airbox, But you have to use his intake. Here is an air filter kit from noss Machine that uses a K&N with the stock airbox. It elimanates the screen in the intake, But still uses the stock intake.......High Flow Airbox Flange and Huge K&N Filter
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#9
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I just installed the Pro Design kit on mine. You have to drill out the 5 rivets that hold in the cone thingy. The holes are then used for the billet adaptor. One thing to note is make sure you use some gasket sealant (what ever kind you prefer) in addition to the oring it comes with because it may not make a perfect seal with just the oring. Installation is easy, it helps that the airbox is very simple to remove.
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