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how long is the "lag" ?
Are you positive it is entirely due to engine noise? 6000rpm in 4th on an auto is well over 100mph.
Do you experience this in any other gear in this specified rpm range?
Are you wide open throttle when shifting?
Are you manually shifting or auto shifting w/ or w/o sport mode and or TC/VSC on or off? Do changing any of these variables change this from happening?
Does it feel like its losing power when this happens or hesitating to start re-climbing RPMs after shifting?
Have you asked delicious tuning about it and/or sent them logs of it happening?
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