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It's lean because it wants more fuel from increasing the boost. More air needs more fuel in order to make more power at the same target AFR. If you don't add fuel with the boost increase, then it will go lean. Probably will need 2-3% more airflow added to the MAF table above 7000hz or so. Adding airflow to the MAF table will signal the injectors to spray more fuel.
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2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |