the wheels are 15's, i got the base model, so maybe different models have different wheel sizes?
as far as the emission test goes, i have a buddy who owns a smog shop so i get tested as much as i want for free. i also have cat-back exhaust so im not sure if ill pass with the intake on or off. im also planning on getting a header soon, then ill just throw all hopes of passing smog out the window 
i love the intake, i think it was worth the wait. the car accelerates out of first gear so much quicker, and it sounds mean when you step on it.
i dont like the 15's either, but i dont have any empty credit cards to but new wheels with