Not a big deal. Look for a cobra guy who wants to swap the other way (although your parts are a bit old). I had the option to swap at one point but couldnt be bothered with it - I like my current set-up a lot.
I think you need a new cat-back and the entire IRS including shocks and springs etc. but I'm no expert by any means - I would have had my mechanic friend do the swap for me.
I've done it like 4 times (twice on my car, two other times on other peoples cars). For an SN you will need to either drill holes in the frame rails and weld in nuts for the rear upper subframe brackets, or weld them on (if you weld them, get reinforcement plates too). The catack will need to be modded for the tips also.
I put a IRS from a 03 cobra in mine 96. I traded the guy my completely stock solid w/ stock suspension and lakewood 50/50's for his stock IRS straight up. No cash out of either of our pockets.
not hard, but u do have to weld those 2 brackets one