Originally Posted by neonknight0311
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.
Yeah you take a risk with ebay, but I have had nothing but great buying experiences (over 25 purchases). As long as you are smart enough to realize when you might get screwed (no feedback on seller or insanely low prices), you will be fine. I wouldn't shy away from such a great marketplace because a few people get the shaft... that happens at walmart too. But I wouldn't mess with the cat too much, I mean for the little you gain you take a big risk for emissions test. I would agree that OEM is probably the best, just get a used one and you are fine.