Disco Exhaust System

Hi All,
I bought my Disco I Today, and it seems its going to need a new exhaust system...as it looks original. In 02 I bought an S2000 (ok, no cracks...I have a TR6 too!) and we made a custom exhaust for it with the help of a local tuner shop. Anyway, my thought is to go back there, yank the pipes and develop a free flowing exhaust complete with cats etc, that are relatively standard/off the shelf items...although with a free flow muffler and perhaps in stainless. Is there any interest in this...out there, and what (if I can get the cost down as we did last time) are people paying for this system as a replacement? I have not looked into it, but the last system is now selling all over the world.
Email me and let me know if this is something you may be interested in.
Regards
Ed

As another note....if there are others in Socal that want to get together and assist in the first off unit, that would help too, I don't mind putting my pipes up for the jig, as they have had it anyway, but the initial cost can be offset, and get much cheaper if we get two or three up there for the first time.....after that...its gravy.
Ed

what are the expected gains from this mod?
am in SOCAL