It goes by where the vehicle is titled and registered so if you buy it from another state and bring it to CA you’ll be ok so long as it was built in Japan.

I was told by a few dealers that all TCH's being built in Japan are coming to the US with the "FE" 50 State option so if you live in CA, NJ, NY, a few others you will have the 15/150 federal emissions warranty. More info on this subject can be found in some other threads on this board. Who knows what’s going to happen once they start building them here in the US. There are two EPA listings for the TCH so Its likely there may be a higher HP less clean version built in Kentucky.

Just an FYI, I believe that repairs under the federal warranty are prorated not 100% free, someone correct me if I’m wrong but I recall a friend getting a catalytic converter replaced on a GMC Jimmy that was 7 years old and still under the federal emissions warranty and I believe he had to pay for some part of the bill.