The Corsa Xtreme cat-back kit is emissions legal in all 50 states. California's noise ordinances are a little weird in that the state-level regulations only govern vehicles under 6000lb GVWRs, which your average Raptor exceeds. However, local ordinances can vary wildly, so your best bet would to check your local rules and regulations regarding exhaust noise. If you're concerned at all about your neighbors, your best bet would be to get the Corsa Sport Kit and just see where you're at with it. If you feel like you can go louder, then all you'd have to do is get a Corsa Resonator Delete Kit to turn your "Sport" system into an "Extreme" system.