:blah I wouldn't get nerfs for the sand, they don't do anything for you but hurt. You cann't move your bike with your feet and you always have to watch your step and step overthem. I take mine off for anything except racing and plus they are not functional in the sand, they are only good for racing because they protect another quad's tire form locking into you.
K&N is a good Idea but make sure to use an outerwear.
if you go on long dune rides get a pipe with a heat shield because is will protect you.
If you are a serious duner, I would get an aftermarket oil tank that has more oil capacity, revalve the stock shocks for dunes and get some outerwears to protect them. I would also put clear proctective film on all the aluminuim part you have like bumpers and such to protect them from getting sand blasted. if you have or are getting aftermarket rims and tires I would do the rims too if they are aluminuim. I think that hypers are the way to go though. as for the tires, if you race the drags and hill get a hauler there is nothing better, if you like to dune aggressively and turn sharp then get something like sand stars or sand sharks. On the front get dune tires don't use the stock for 2 reasons, the aftermarket rims make you wider and more stable and the tires have less drag through the sand and turn better. If you drag only get an adjustible axle and make it smaller so you are wider in the front than the rear so your rears go through undisturbed sand, if you don't drag get some wider a-arms like +3 and a good axle, like rpm or lonestar also adj and make it wider because it is the wider the better in the dunes you almost want to be square :lol. other than that have fun and be safe and don't litter