I want to suggest moderation here. Don't post your VIN, but don't be afraid to post modifications to your car. Balance is the key. No one here wants to be responsible for your denied warranty claim on your drivetrain because your tune and VIN were made public. We do, however, want to discuss the potential to enhance our cars.
I'm also going to point out that OnStar neither has the staff nor the desire to follow your cars without your permission. It may even be illegal for them to conduct this sort of unauthorized espionage. Don't worry about OnStar. Worry about what personal information you post online.
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