Find the emission disclosure sticker in the engine compartment. I think it's stuck to the underside of the hood on the stinger. It will either say something like 'Meets Federal EPA requirements for 2018 model year' or 'Meets Federal EPA and California requirements for 2018 model year'. If it's the former, it's 49 state legal, if it's the latter, it's 50 state legal. Manufacturers today typically make all the cars they sell 50 state legal right out of the box so that they only have to make one version...cheaper and easier. On top of that, emission systems don't have the detrimental effects to performance that they did in the 1970s and 80s so there's really no benefit to not just making everything CA compliant.