crackerjacker006

I got a usdm b18c1 for my 99 civic, but i dont have the whole exhaust manifold. I missing the lower down pipe part. Although im not sure i think i need one with the sensor hole in it. My brother has a gsr integra, in which he removed his stock manifold, and i planned on using his, but it has no sensor hole. I have been looking to buy a header, but which one do i need to get: an ls header or a gsr header? Also i dont have the sensor that goes into the header but i do have a spare one that goes into the catalytic converter will this one work properly in its place?