I figure you guys could help me out on this one. I'm on the market for a very good universal catalytic converter that I could weld to a custom mid-pipe I plan on getting made and would like to pass emissions. Piping will be 2.25" in the custom mid-pipe. Even though I will be in an emission free county I would still like to pass. I recently installed a aftermarket header that removes my primary cat on my '07 Scion TC and I'm still currently running my OEM mid-pipe with the secondary cat on there. I do get that go-kart smell when I'm in idle though. I'm curious if there are aftermarket cats that actually lasted a long time and of are good quality? Feed back from your experiences would be highly appreciated.