Is it hard to put in ? What's the best price any one has found for a wolverine.

I'm not sure how different the air box on a Wolverine is from the Warrior, but it's just a matter of removing the box & drilling two holes in the front wall to mount the Pro Design adaptor, being careful to get the o-ring under the adaptor all around. They're all priced between $89 or $99 dollars anywhere I've seen them advertised.