It says intended for offroad use only, but then it says it caters to traffic laws and regulations. What do you think?
http://www.meganracingperformance.com/9200-honda-civic-megan-racing-stainless-test-pipe-p-519.html
I run a high flow cat and as long as the cat filters enough exhaust to prevent a code at the second oxygen sensor (in my car...other cars have more cats and more sensors) then it will pass emissions. Otherwise it may trigger code 0420. They also have oxygen sensor simulators (and the spark plug non fouler trick) that can do the same but if you have visual inspection and they see one then you're likely to fail (even if it's electronic).
That having been said. Megan Racing stuff is the bottom of the barrel, so I wouldn't get a cat from them. I believe magnaflow and vibrant would be my recommendations for a replacement.
Remember, altering the emissions system in your vehicle is technically illegal unless it's past the warranty (usually 8 years) or the dealer won't replace the parts; in that case go to town. Usually, after 3-4 months of driving the stainless new parts will end up matching your stock exhaust anyway, the only difference being they are very easy to clean.
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