Well, the 3s finally works but now I am going through the pain of getting it smogged in CAlifornia, and I need to put a second cat on it. I was looking on eBay and there are plenty for like $60 but im not sure if these are good for my setup. I am also unsure what the air tube on the side is for and if I would need it or not need it.

Thanks.

I love ebay and online sales since you can get a lot of stuff at lower prices, but I would be nervous about buying a CAT on ebay. Since you'll be closely monitored on a computer, I wouldn't trust much that isn't from authorized exhaust shop.

I guess if its a powerseller with tons of feedback would be better, but if theres a shop in town with one going for $70, I would definitely do that instead.

you sure it will pass smog even with a second cat?

dude youre not gonna pass smog with a 3s unless

1 you know someone
2. its a usdm 3s with an egr valve