True. Eastern makes a CARB approved line,their 49 state line is very well made and works without issue even on real problem vehicles like some Toyota.All aftermarket cats are not created equal.Eastern guarantee is 5/50 on materials and performance.
http://www.easterncatalytic.com/literature/downloads/newsletters/EMINewsletterVol3.pdf
http://www.easterncatalytic.com/literature/downloads/newsletters/EMINewsletterVol3.pdf