Re: Billie Joe Armstrong P 90's?
I really doubt it would make that big of a difference, when you crank it, especially for that kind of music. He has a good tone but it's more about the vocals than anything. Even the regular guitar center les paul juniors sound pretty good. You need a good noise gate though, the hum will kill you.
Green Day was one of the first bands I tried to copy when I started playing and like 8 years ago, all I had were humbucker guitars with alnico v's. They sounded close enough.
Plus on their live stuff, Jason Freese contributes a lot to the overall sound, and he plays all sorts of guitars.