Test Pipes? What to Know....

Woketman

I am considering replacing my Cats with test pipes, assuming I will get a few extra ponies (I know it won't be drastic, but 5 or 10 would be nice) when I lose the restriction on the exhaust.

I have a 2019 Nismo and I have questions. I am looking at something like this: They claim a "built in O2 CEL (Check Engine Light) fix. What in the heck is that??? The O2 sensor is certainly going to detect something outside of the normal range and set off the CEL, right? I don't want to have to clear the error codes everytime I drive the car! How can this be? Should I go for resonated or not? How much, what difference results??? What is the difference? Any other suggestions, recommendations?

Thanks guys!!!!

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