Yes it will. It needs a C.A.R.B. sticker, showing that the California Air Resources Board has approved its use.
This has been law in California for decades. It has not been well enforced for years except during smog checks. A recent development is that law enforcement is starting to get into this again, with police departments providing training of what to look for.
As for if it effects smog or not, it might. It must be realized that the occasional smog checks we go through are not definitive tests like the automakers must go through to get an engine certified. These are merely validation checks, with the assumption that there have been no modifications. The testing they go through for engine certification actually collect tailpipe gases in a bag and then the contents are measured. The "smog check" tests take very limited readings. That is why suppliers of intake systems need to go through extensive testing to show that there is no significant impact on emissions. Without the C.A.R.B. certification there is not way to know.
