For what its worth, I think I am one of about 3 people who didn't see gains. I really think its because my car is pretty strong to begin with, and from the 1200 mile point, over 70% of the miles on it have been on the racetrack, so it was broken in and is used a different environment than most here.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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