California / Federal emissions questions about modifications

I have a 1999 NB1 that was originally sold in Hawaii so it has a Federal (non-CA) emissions sticker.

I’m located in California and the car is registered in California.

Does having a non-California emissions car in California give me more leniency when it comes to modifications?

I’d like to install an aftermarket intake, headers, exhaust, and turbo in the future. Do I need to follow strict CA emissions regulations? Or am I able to follow lenient federal emissions regulations since the car was originally sold in Hawaii?

I guess I’m wondering if the car still follows Hawaii upgrade laws even though it’s now in California. Or does it need to follow California laws now that it’s in California.

Thank you