okay, I already did a search, but there were way too many classified posts, and I got conflicting info. I just need some clarification

I am going to be gettin a swap, b18c jdm gsr into my 97 civic HX coupe. I know I will have to get a new cat. Question is, what kind of cat would I be looking to purchase? I am going to be using the stock jdm gsr header, and stock hx exhaust piping. Stock exhaust piping may be modded however much, I do not care. Main thing i'm worried about is what cat to get to fit the jdm gsr header. Would a stock usdm gsr cat fit, and if so, what year would i need? One or two O2 bungs?

Thanks.

 

Im pretty sure that the gsr had the 02 bung in the cat. What i did is went to a muffler shop and had him extend the cat the extra length for me.