I'm very happy with my exhaust set up, Its a Toyosport cat back,the one on our car was a good deal and they are even better today, I also have a stainless Piper cat (Mike Satur stocks them) flexi and manifold are standard. There are a few clips here . Its a higher pitch than some but very crisp.
http://s982.photobucket.com/albums/ae305/S_MG_B/Brmm%20Brm/
The Iphone doesnt do justice to the amount of sound, the giggles are a more reliable indicator.
After listening to mine some club members here put the cat back onto standard cats, this gives a nice tone but less volume. I'm quite happy with my car its a bit loud but not deafening when you nail it but quiet when you are cruising. This is probably as far as you can take it for a 1.6 without a custom manifold with tuned primaries, the long primary ones out there are designed for the 1.8. .
I'm surprised that the MGB didnt work out, I did put a serious wedge into it in the late 80s/early90s, but its been good value for the past 20 years.
Here it is at an event in Holland in 2000 next to local car.