Thanks Simon, I do know of H&S but thought that if someone was used to S&S engines, and specifically their exhausts, it may shorten the development time.
Rudolf: Inconel is quite often used for exhausts (though not cheap) and
these people amongst others can do exhausts in it. I agree that it is duller than chrome though.
Thanks Mike, maybe something similar is what I am looking for, though it may be more difficult to fit them on the curved bits that actually discolour.
