one that utilizes the factory setup,basically a replacement for the factory filter,which is a bad design by Yamaha as it fits sloppy
the second (Pro Flow),changes the intire way the filter is attatched,,,by way of a differant style of a filter that clamps to a Flange that bolts to your airbox,and has a "O" ring seal,,,it also has a outerwares that slips over the filter
They also let you just buy the adapter on that website for $64. But its worth it just order it with another filter IMO. That way when ones dirty you can just install the other one and be ready to go and then clean it when you got time. Nothiing wrong with spares.
There is an alternative to the PRO Flow and that is to search in your local hardware store for a PVC 3" flange. You can modify and install this flange in the same fashion as the PRO FLOW flange for the total cost of under $5 for the flange then buy your choice of filter and you will have no more than $40 into the project.
Use a flange, either a Pro Design or DKNARND's home made one and get the filter that clamps on. The stock design is bad and the K&N filter made for the stock design is even worse. Although you are probably getting real good air flow with your current set up.
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