FasterNU4

I need help with jetting suggestions. Riding will be So Cal (sea level to 2500 ft) 60-90 degrees. I'm a dirt bike guy... just trying to help my buddy at work. He has a 2003 banshee.. just put Toomey TR6 exhausts on it. It has stock jetting. I need to know the following: What is the stock jetting?? (concerned about main specifically) and also, any recommendations on jetting for this combo? He got a dynojet kit with it. It has different needles(DNO 304) and two different mains 280 and 270. Should we change the needles/jetting? I read that the needles really help the midrange on another forum. Oh , also the kit said to drill like 6x holes in the airbox... Please let me know if this is a good idea, or if there is any better mods to do. The more opinions the better...