I'm Sorry, the one I was thinking about was the Greddy EVO2.
This is the exact car that had the particular system I speak of.
http://www.cardomain.com/ride/761035 Exhaust pics are about 3/4 the way down the page.
I have the Greddy SP2 on my Max, and I love it. Deep growl between 1500 and 3500rpms, and it howls at WOT.
Any free flowing cat-back is going to result in improvements. One of the strengths of the VQ series is that, even in stock forms, the better you can make them breath (intake and exhaust) the more power you'll make.