my friend has an integra with comptech intake and exhaust, and he passed smog no problem. It just depends on the product, and condition of the car

 

found this article to confirm a rumor I once heard: by California law, you have to swap in an engine that is the same year or newer than your car's year. There's also some other information about doing swaps in CA

http://www.v8s10.com/Pages/Chevrolet_S-10_V-8_Smog.html

 

what all do you need for a mini me