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A friend runs an 83 924 with the standrd Euro compresssion and uses a lead substitute additive. The main thing with these additives is not to mix chemistries- choose an additive an stick with it. I use Millers brand in my 11:1 compression Rover V8 which regularly gets revved to 6200 without pinking.
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1986 924S bought new. Now used for AutoX and street.
Chipped, throttle cam, highflow filter in original airbox/snorkel, 14mm rear sway
Hyundai Ioniq hybrid daily driver
Vindicator Vulcan V8 spyder, street legal sports racing car
(300hp,1400 lbs kerb weight) used for sprints on circuits, and hillclimbs
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