The second clamp is used to keep the metal mesh inside the filter in place. Just snug that one down enough to keep it in place. If you use the K&N filter, the second clamp isnt necessary.

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Boomer '99 Wolverine

 

Here's a dumb question for any Warrior owners who have the Pro Flow filter kit.

When I received the kit a few months ago I noticed it came with two clamps, but when installing it I only used one thinking the extra one was a spare. After looking through a catalog the other day though, I noticed both were used to hold the filter in place. Am I supposed to be using both clamps, and if so, how the heck do you get both on considering the shortness of the mount on the adaptor?