If you live in Cali and your car is OBDII don't bother putting anything on besides OEM. If you get pegged you'll be labeled a gross polluter and you don't want to go there. And watch out for Ebay sellers, make sure they have what they are selling IN STOCK and it is right for you application. If your not too sure about the seller use a credit card and NOT paypal because it is virtually impossible to reverse a charge with paypal. I speak from experience.