I just took my Sti for its first smog on 1-2-12. It passed with no problems after reverting it back to stock before I took it in. The only upgrades I left on it which even passed visual inspection where the invidia uppipe, catback, frount mount intercooler with the ntercooler sprayer, AEM intake. Of course I recommend to have a pre-test done first, but those items listed are what I left on. Now for the fun part, to put all my upgrades back on and to reflash my ECU.