Is there yet something from K&N or Pro Design or...

 

Not that I have found, but someone in this forum noted in a post the other day he was running a K&N on his YFZ. I replied asking where he got it and never go an answer.

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I just bought a GYT-R multi stage foam filter for my YFZ450 at the local yamaha dealer. I hope it works ok. I had to replace my stock filter because it's starting to tear off in little chunks around the white part that fits snug against the airbox. I just hope it doesn't screw up my jetting. And I hope it gets atleast as much airflow as the stock one. They have a picture of the filter on the Yamaha website.

 

I was at my dealer last night trying to pick up a spare filter - don't even have them in stock - and this guy was telling me how to modify the airbox so that I could use a Banshee k&N. There is this metal adapter plate that you need and the filter. You have to use a dremel to cut off the plastic cone on the inside of the air box - cut it off flush with the sidewall. Then use some silicone adhesive - they have some special stuff to use - and attach the metal plate over the hole left from cutting off the cone. Then the K&N just slips onto the metal plate adapter with a metal hose clamp holding it on. Looks like a good fit and seemed pretty simple to do the work. He said that you really need to have the jet kit installed if you are gonna go this way, though, so I am gonna wait a bit on it.