Normal, 911 does it too. Sports is meant to emulate racing. If tracking you don't run in normal mode. Engine prep for constant acceleration, WOT. Best answer I could find is from Pedro. Although talking Boxster/Cayman, the other cars exhibit the same behavior.
You might also want to watch your voltmeter. In normal mode, the alternator will rise and fall with braking doing some form of regenerative braking to charge the battery. In sport, its ALWAYS charging much higher.
One is "normal", the other is "racing" best explanation I got.
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