That's a very CA viewpoint. I moved from CA to NC and as long as the onboard computer isn't throwing a code and your emissions stuff (appears to be) in place they don't care. I have two vehicles that are tuned and they pass emissions no problem. They can see this (different means per manufacturer, I think BMW throws an invalid checksum and Ford does it by key trigger count or something) but since the vehicles are still blowing clean it's fine.

We just had a few counties discontinue emissions checks and now only do safety checks up to 30 years past which they don't inspect at all.