Try contacting SLP. For legal reasons they might make it hard for you to obtain the sticker if at all. You may or may not have trouble it just depends on how anal the smog test station is. When I lived in CA I failed a smog test due to some headers on my old Camaro even though the carb number was clearly stamped right on one of the primary tubes. So I had to go to a referee station to pass.
If you want to avoid the hassle just swap in your stock intake box before taking it for the smog test. It only takes a few minutes and you only need to smog it every other year. For my Camaro it took about a day of work to swap all the parts necessary to pass smog and then I had to swap everything back afterwards, but that is one way to stick it to those tree huggers.
