Maybe it depends on the car but I think as long as you have the extended bungs, make sure there are no leaks and O2 sensors are tight, you shouldn't have a problem.
I started out with Berk high flow cats for about 7000 miles and I now have the CNT resonated test pipes. Not a CEL from either set. I've had the RTP's for only about 100 miles so far but no issues and I am very impressed with the quality for the price.
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