The VQ can sound nice, but it really needs a very specific combination. There was one guy on here who achieved nirvana for me, can't remember who it was but he had a dark blue HR coupe, came to the Grasshopper meet a few years back and I've never heard a Zed sound so good in all my life. Most 350 exhausts just sound LOUD, and whilst that's definitely fun and entertaining I don't think I'd call them aurally aesthetic.
As far as four pots go, I quite like a K-series with some lumpy cams. Gives it personality.