2000 Nissan Frontier - Cal Emissions Replacement

Need to replace original exhaust system. The truck was built according to California emission regulations but I live in New Hampshire. Can the exhaust system be replaced with any aftermarket system that fits the truck or does it need a special California setup in order to run properly? Thank you

I’m just guessing the exhaust system is the same. To meet California requirement being in engine differences.
An independent muffler shop could probably tell just by looking at your truck.

My guess is the only difference is the cat for California cars has been certified to meet their standards.