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Old 07-19-2018, 07:33 AM   #3
TeleZL1
 
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Drives: 2018 ZL1
Join Date: Sep 2017
Location: Texas
Posts: 50
I have not done this but I have researched and plan to do this very soon. Secondary cats are not monitored. Therefore, as long as you have a good weld/seal on your "new" exhaust you should not throw a code. Being that they do not do sniffers on these cars you should be fine as the Primary cats are the only ones in the "loop".
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