Aight going today to pick up a k&N filter for my boss and wanted to know if I should rejet and if I should what is the best jet to go with. Also if I get the filter and want to put some holes in the top of airbox what jet should I go with then just trying to get some better performance not much info on the thread earlier. Any help would be appreciated.

 

You shouldn't need to rejet if you are just getting the filter. If you put an aftermarket exhaust on then you will need too. The boss I had actually ran better with no holes in the airbox , even after rejetting for it, so I plugged the holes back up and went back to the stock jetting. It may be different for you though as I ride in a lot of high altitude areas.
Make sure you get the outer wear for the filter though or you will be cleaning it often.

 

Open up my pictures and read the introduction on the top. I list the size jet and mod.'s that work for me at 500' above sea level. I hope it helps.