I have a CRX with a 90 b18a1 engine swap, what oem exhaust manifold fits without cutting or doing anything to the stock crossmember?

Thank you, also, a stock ls 41 manifold would mate with a stock 41 civic downpipe?

Thank you

 

and as threads are worthless without pics, some for fun...

 

When I had my b18a, I had the obd1 4-2-1 manifold that fit through the cross member. The flange did not line up with the exhaust though. I am currently running a 96 jdm itr manifold 4-2-1 and it clears as well.

 

Stock LS manifold should fit fine. You might have to modify the length of your mid pipe to match up with the down pipe.