When I was looking for some bosozoku style videos I came across an exhaust builder who creates exhausts for vans and places videos of the exhausts he built on Youtube. This video is one of those exhausts:
At first I thought it was only this video in which it sounded as a bird, but I tormented myself and watched (and heard) every single one of them and I can tell you all of them sound the same! :D
I really think it is a piece of art and a big achievement to create such exhausts, but I’m pretty sure I would never want an exhaust on my car which sounds like a bird!
do yo know the hedman headers, i think this one has the part that you are looking. the exhaust. try to check this out if it is what you are looking.