You are way better off getting some resonated test pipes. You wont throw a code if you get a "CEL fix". I have gutted cats and had test pipes. I am just giving you my
from personal experience. You should save the cats or sell them to make money!
Here is resonated test pipes with the CEL fix built in.
370z Exhaust / Headers / Test Pipes / Cats - CNT RACING 09-10 Nissan 370z Resonated Test Pipes Free Shipping