Eh, universal high-flow catalytic converters are cheap enough ($70-100) and have such minimal loss of power that I wouldn't run a street car without one. I paid extra to get one on my Mazdaspeed3's aftermarket midpipe. They won't last as long as an OEM cat, but I can also buy 10 of them for the same price.
When I want to smell like uncatalyzed exhaust, I'll mow my lawn. Or ride my motorcycle.