Thanks for all the info man I did buy one I don't mind having to switch to stock one for test or anything just wanted to know if I had to I live in cali aswell maybe and you do get to hear that supercharger a lot more sounds amazing.They have not had it tested or submitted for approval with a carb number so no. It should pass smog as far as emissions go but if you are in a state like CA or NY it may fail visual inspection. I’m in CA and it’s the reason I have not got it. But I have also read the stock airbox is super efficient and already delivers cold air to our cars. But I also hear you can really hear the supercharger whine with a CAI.