well since I'm in NZ I've got cheaper access to X-Force products than US ones. I guess most of you have probably never hear of them?
http://www.xforce.com.au/bolt-on-sys...0/vid-99002065
I've been told 100CPSI cat won't make much of a difference over the OEM one. So for me it would either be no cat at all or leave OEM cat there with a cat-back 2.5 system.