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unless you have to pass emmisions test then you dont need a cat.. i had two cats on mine and i put on a high flow cat on where my second one was.. with our cars, we dont gain anything be taking off the cat unless you have a turbo or running a 75 or more shot of nitrous... you might i have to put one on though if you are throwing codes.. cuz if you car if throwing a lot of code it wont run as well and you will actually lose power.. so you can try to run it with out the cat and just add the second o2 sensor in....let us know how it goes...
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