definitly porting, head milling and a filter, some B-1 Toomey's would be nice too. as for tires, I have had great luck with my RAZR's so i would highly recommend them

 

Hey when you say drill 6 1inch holes in the air box lid. Will this let in alot of dirt and dust and ruin your engine. Also what if you ride in alot of mud and water and its always getting up under your sit and into the airbox that cant be good right? im just wondering cuz i was thinking about doing that but i ride in alot of mud and water and dust so i need to find out if i can do it or not, please give me an answer! thanx

 

Try these... vents

the picture is from rocky mountain atv web site

 

So you can put those vents in the 1 inch holes is that what you mean ?

 

those vent things are crap after one ride the little filters all fall out

 

if your riding mud i definetly would not recomend drilling anything in the airbox. if you do alot of mud riding you may have bought the wrong quad! its like a having a sportscar or a truck. wich do you drive in the mud? you can still get it dirty but bogin it. dont recomend it.

 

maybe on yours they did....

 

if you dont do serious water or mud riding, why not just take off the air box lid, unstead of those wholes?
I took my lid off, jetted it and put a uni filter and filter skin on the uni and havn't had a days problem. I mean, I do all kinds of everyday riding and nothing clogs up my filter, it actually stays kinda clean.