I'm having an exhaust made for my rs16i, exactly as the original. Including all boxes and the back box is identical in stainless and tig welded by a guy that makes custom porsche ones

I dropped him off the old rusty one, but he said he needs the car to make it perfect

I can pass his number to you. He's in redditch tho, not cheap. But you get an amazing exhaust

Might be worth a try