Thx for the link. Unfortunately it doesn't really help much

It's hard to judge how much the exhausts will drone. If I was looking for a particular sound to the exhaust, that site would be perfect. But I don't really care what it sounds like as long as it's quiet and flows better than stock.
I emailed the site owner to see if he has any suggestions. I'm leaning a bit towards just getting a non-flattened y-pipe, borla catback, and a cutout I can remove at the track, and hoping for the best...