Not sure if you've seen my bay or not, but it's orange and, erm, orange! I think the polished plenum look amazing, and I also have a core strut from the MopedMan which look great polished too.
NBt I have nothing else that's polished in my bay, so, even though I like the shiny plenum, it would not have worked in my bay either. Hence the reason I painted mine....
Orange