A lot of times, it's not the affect of emissions that causes you to fail the sniffer. Well, in Cali, we have this "extra" test tossed in by "the guys" to make it that much harder for you to pass the emmisions...and also to generate revenue for your uncle sam. It's called the "visual inspection" and dat's the reason why so many of your precious jdm motors aren't gonna get a legal "motor change" certificate. Be rest assured that if the guys tending the smog station is a real a**hole, he'll fail you for having that shiny intake under the hood, affecting emissions or not. What the hell do they have business with what we put in our cars? The only thing they should be concered about is whether the car passes or fail. Unfortunately, it's not! So the next time you have to kiss that red sticker on your rear window, be sure to thank the idiot who spit that test out of his arse to screw us. *Cali only! Some states may differ.
Now, about the intercooler and BOV, those probably won't affect emissions (on a MAP car), but you're still gonna hate that visual inspection test.