spacers hubs and filter

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hey couple questions. lookin into parts for my girlfriend's quad 08 z400 ltd editon just want some opinions on running wider hubs in the rear and spacers up front for some extra stability. she doesn really jump at all yet but probly lil jumps in summer but mostly trail riding. i don't think an axle is quite worth the money unless your racing or jumping lots i know thers lots of good and bad everyone has a different opinion but just wanna know if its worth it. my friend has a dvx400 with wider hubs in rear and it looks pretty good.

also i run a k&n on my honda 440ex i got it with a dynojet kit when my quad was stock and it helped lots but ppl say k&n are bad just wanna know more opinions on it what filter helps with power K&N uni twinar?? we ride mostly in sandy areas

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one more question that everyone has a different opinion on pipes? looking for a slipon whats a good one i know there all good an its personal preffernce but lookin for lower to mid power and not overly loud.