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My understanding is any lead in the gas will kill the cats.
You will basically see no difference between 91 and 93 RON
The ECU will adjust for virtually any octane 93 and below
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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