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Not sure why. Flex fuel is probably the best mod you can do on a 6th gen SS or ZL1. These engines crave higher octane. If you don't want to run Flex then get a Meth injection kit.
Big difference in power and performance on these cars when you can go from 12 degrees of timing up to 18-20.
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2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel
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