Depending on how it goes with my custom exhaust and turbo install, I was thinking about making replacement primary catalytic converter assemblies for people using universal cats. In theory I should be able to make something of decent quality for $200-300, but I wouldn't know for sure how well they would hold up over time until people tried them. Also, I'm not sure there would be a way for me to legally sale them to people in CA.
It is known to the state of California that installing a catalytic converter on a car without the correct part number stamped on the side may cause cancer and, in extreme cases, may rip a hole in the space-time continuum.
-><- Johnathan Valentino -><-
#1 2000 MT, 200k+ mi, owned since 2014, got new old engine in 2016
#2 2000 MT, 200k+ mi, owned since 2015, No A/C, lots of dents, works
Best tank: 69 MPG . . . Recent tank: 64 MPG, June 2016