Header Question, What stock components will an ebay header replace? Options

[senick]

I did do a search, and I read up on the 7a header install writeup, which was helpful. However, I still have a few questions.

First, in the 7a exhaust, is that a catalytic converter directly downstream of the exhaust manifold? It's a larger cylindrical part that I can't see what else it could be.

Second, will this ebay header replace everything up to the main cat?

Finally, the writeup states that there are two O2 sensors, but is that also the case with an OBDI car? There is no claim by the header manufacturer that there are two spots for O2 sensors, so does that mean I would have to get the downstream one welded in?

Thank you very much for any help.

[senick]

Yeah, it does specify a Celica ST. I guess the question is; is the exhaust system different in a corolla and celica st? I think I'll just order it though. If I have to take it to an exhaust shop then so be it. I just worry about the oil filter, but the location would be the same on any 7a car right? I mean the engine is exactly the same.