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I'm not very aquainted with performance mods for ATV's. I'm not looking for anything radical just something to "open it up" a little bit.

Any suggestions? Exhaust, re-jet, ect.....
 

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Well that basic's for more performance is to let the engine breath better, more air in and more air out with the proper air/fuel mixture (rejetting) in the middle. If you do some searching in the forums you will find plenty of mod idea's for your 400.
A couple that come to mind are from LittleCat on his old 400, one was modifing the airbox lid and the other was a muffler mod. I did a quick search and found the post I was thinking of thumbguy
Airbox Mod 1 Airbox Mod 2
Exhaust Mod
 
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