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I have a stock and very dirty Yamaha foam air filter surrounding the internal canister/carcass (I don't know what those are called, since Yamaha doesn't even bother to name the thing inside their service manual). I purchased a 490 mile used - 2007 Wolverine 450 SE last week and the new filters, oils, chemicals arrived yesterday, from AMSoil & DennisKirk. I am handy enough with tools and 'stuff' to be able to handle routine vehicle maintenance. A service manual is often required, and I'm good to go. However, when shopping for replacement air filtration @ DennisKirk's online location (specifically for my 2007 Wolverine) one of the things which intrigued me was obtaining a K&N precharger. The K&N air filter element itself was $60 which in hindsight might be a good deal. I dunno - I'm a n00b to purchasing gear for an ATV. But it sounded like the precharger might be a decent $26 investment to further filter out microscopic chaff before feeding air to the carb. My only question is...where does something like this precharger fit over? Surely not over the foam filter (I purchased a Uni 2-stage, which I will have to oil up myself). My guess is K&N precharger is to slip over the outside of the perforated canister, which the foam air filter also slides over? It's going to be a very tight fit even there. I've searched the entire forum for any existing threads which might discuss this topic, and found nothing. The Yamaha service manual is barely helpful; they are about as helpful as pc computer instruction booklets I've used for the last 20 years. Is anyone using one of these precharger bags, or is this overkill and I as a n00b just selected & purchased something I don't really need? Wouldn't be the 1st time. Also, what do you folks prefer? The gauzy cotton filters like the K&Ns or the foam filters? Pre-oiled or do it yourself? Thanks