Any available mods/upgrades for 02' Kodiak 400 ??

[z400mayhem]

Hi, I want to get a little more out of my 2002 kodiak 400. I was wondering if there are any available mods for it, other than pipe/filter and jet. I was looking at one of these Scary Fast Power Now valves? Do they actually work?
Power Valve (http://www.rockymountainatvmc.com/productDetail.do?navType=type&vehicleId=8240&webTypeId=80&navTitle=Intake%2FFuel&webCatId=16&stockId=134439&prodFamilyId=1075)

thanks.

[Timmy b t]

You might not like my answer, but I would go to grizzly central forum and ask there. There is alot of very knowlegible people there