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In the past (non-Porsches), I have used Redline to combat this problem. While I don't (and wouldn't) use Redline in my 911, it has worked well in previous BMWs and such.
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2018 718 Cayman 2.0
Priors - '72 911T coupe, '84 911 Carrera coupe, '84 944, '73 914 2.0
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