I am running the stock ECU. Mind you, I personally have deleted the cats, and I believe to stay completely legal you would have to retain both sets of stock cats from the Z/G35, but I'm not sure on that. In Cali would you have to pass the rules for the Z? Or for the OEM S Chassis? If it's the S Chassis, then you could easily put in high flow cats, and delete the heated cats from the Z.
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