Couldn't you use the stock airbox but cut down the rubber tube or replace it? How do you get passed the visual inspection for SMOG?
I couldn't find a good way to seal it once the tube is cut. And at the time I didn't have time to monkey with it.
SMOG has not been a problem. Once the guy said he did not see a CARB sticker on the intake tube, but he passed me.
The K&N with the pre-filter works, I was just wondering if there was a cone shaped paper one. I have not seen any, but I have not looked either.
When I did the 62mm TB swap I did not see any fine dust/powder on the inside of the tube. So I guess it's doing it's job.