I wish I could help you with the links...but I got mine years ago so I'm not sure who carries them now.
I've been thinking about taking the cats out...but I like the way it sounds now and don't wanna go through the trouble of doing that.
I would definitely recommend longtubes as well.
The borla catback looks nice and cleans up rather nice as well.
EDIT: Also note that I have heads, cam, and a ported gt-40 intake....so your car may sound a bit different.....but I don't think it'd sound much different.
Also note that the first two vids are with a supercharger...which makes it a lot more aggressive sounding. The 3rd video is what it sounds like without the supercharger.
Honestly though, I think you'll love that exhaust setup, it just sounds a lot different than most other mustangs
I know and that's what I am going for. There's only a few people here that have mods on theirs. I found some dealers down in vegas so it may be another couple weeks before I get down there.