Originally Posted by klubbheads

Cars that smell like burned gas from the exhaust will not pass the emissions no matter what. Crawford makes one of the most expensive HFCs on G35s and I have smelled the burning gasses standing next to the car that had those cats on. Any cat that is less restrictive than stock will not let the car pass emissions. I am talking about the VQ engine. In your case, civic might pass the emissions with HFC because it is already one of the cleanest burning gasoline cars on the market.