Crackstar, be careful about running without an airfilter, I was running with a free-flowing filter I made and my bike died, I'm pretty sure it was running too lean and I overheated it. I don't know what a stock airbox should look like, none of my bikes have one, but I can tell you that 4 layers of oiled pantyhose stretched over an opening the diameter of a tuna can is NOT restrictive enough.