front catalytic converter

Many of the 'online' catalytic converters are not EPA certified, so your vehicle may fail its next emissions inspection. The certified CATS are more robust and therefore cost more. There has been a lot of trouble with cheap quality CATS. I do Emissions work in CA and I have to write down the number of each catalytic converter that has been replaced since 1/1/2009 when I do a test and then I have to check it in a database. If the number is not correct, the car fails. This is because the EPA found that most of the after market converters were not effective after only 6 mos of use! If the car were re-tested, it would fail. Good Luck