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OEM all the way, unless you are upgrading catalysts. Each LEGIT/LEGAL catalyst is suppose to have a stamp on it, or it wont pass state inspections the legit way.
I bought a high flow cat that worked just fine but swapped back to test pipe instead (going with JDM GSR motor). the cat did have all the internals of a cat but better flow design.......just remember you get what you pay for!
were u get one like that for 60, but im mainly trying to get one to make my car quiter thats all i really need is for my car to be as quiet as possible