GSr Exhaust Manifold

This question might sound sort of strange, but how well would a stock GSr exhaust manifold, off of a 3G GSr, work as a header on a b18a1 engine? Would it even fit properly?

if you had a 92-93 it would fit properly. but on your 90-91 the manifold is going to be too short and the O2 sensor is going to be in the wrong place.

the 92-93 gsr manifold is better than the stock 90-91 piece, but not better enough to warrant having to pay for modifications to get it to fit…just get an aftermarket 90-91 header.

I thought it would be short, but thanks for the clarification.