Been preaching that for years. Its a win/win and if your missing that 4 HP during cruise, when its active, your feeling something else. I can buy a 49 state cat online for my 49 state FED Mazda but I have to send a copy of the registration proving its a 49 state car to get it shipped ot CA. This is from Canada so Maybe they are a little cautious or a little ignorant on CARB restrictions. For me to be able to register a 49 state 1983 model in CA was a minor miracle, I think it had to do with a CA lien sale loophole where the seller does NOT have to smog it prior to transferring title. I don't know how it could have been done without the lien sale situation. (He fixed this car for a visiting WA state resident and she never picked it back up so the mechanic took a lien on it and sold it to me).