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Stock fuel map vs any exhaust flow increase is going to be lean. From the current tune to a different exhaust.. that depends. I reused the header gaskets when I put a cat delete on and had a leak at the y pipe clamp area, as a result my fuel table was not correctly maintained due to exhaust leaks. My full akfro system has no leak points to ingest atmosphere and fool my lambda sensor. Mileage and idle smoothness increased without changing my fuel map.