No reason to hop it up really. I just like a touch bit more snap. The reason I got the 400 and nothing bigger is I got it brand new off the showroom floor as new old stock for $3,500. It was the last 06' they had. I won't be using it for mud bogs or anything crazy, just riding for fun. I will probably just put the k&n on it, jet it and see where that gets me when I get a few hundred more miles on it. Thanks for all the advice.

 

I've got about 220 miles on the quad now. It seems to waking up more every time I drive it. Thanks for the input guys. I will be rejetting and putting the K&N on next.

 

With regard to jetting - it is not a matter of just picking a jet, the engine determines what size jet. So be careful, you could end up with a rich or lean condition, neither is going to give you the results that you may be looking for, you could end up with poor performance and a host of other side affects.