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     The GTR uses a secondary air bypass system to 'light off' the cats quicker, strictly for emissions purposes.  Since engines without cats have absolutely no need for this secondary air bypass system, these block off plates will allow you to eliminate that unnecessary hardware.  Removing it saves a lot of space on the rear of the engine and a fair amount of weight as well (as the solenoids removed have a lot of cast iron on them). To address the software end of this solution, you'll simply disable all DTC's related to the secondary air bypass system through your Cobb Tuning AccessPORT.