Was checking over the LT80 after a day of riding and noticed the hose from the air box to the carb is cracked half way around where it connects to the carb. Looks like the hose is part of the bottom half of the air box. Can I buy just the bottom half or is it all one piece?

 

You can buy the part that is cracked.
Part# 13882-40B00
About 13 bucks.

 

what is the best air filter to use on a LT 80?

 

Any foam filter is good.
ie: stock, twin Air, Uni.
Oil them up good.