I haven't been on this forum for some time but it looks new and improved, so here goes.
I am the original owner of a 2004 CTS-V. In the beginning of this universe there was a single option, "NONE".
Billy Boat Exhaust was the first
vender to offer a custom exhaust for the V (months and months before Corsa). I was one of B&B's first V customers.
After almost two years, I could not be happier with my exhaust system. That would be a Tri-Y headers with Cats, 3" SS mandrel bent X piped cat back exhaust with 4.25 inch doubled walled tips. In a word, "Beautiful". The polish, material, and welds are a work of art.
With that said B&B has not sat idly by, In the two years since I bought my exhaust he has continued to refine his products (I visit their WEB site every so often). I'd imagine he continues to refine his products through R&D and I know through others, he listens to his customers.
I have no afiliation with B&B, I just think they make great products.