It's not a "PCM tuner," it's a brand new PCM that is tuned that you swap with your stock one.
Quote:
Speed limiter removed
3-1 and 4-2 skip shifts
Transmission line pressure increased
Shift points moved (5800-6000rpms)
Fan turn on points altered as follows:
186 degree F Turn On
Fuel/spark adjustments as follows:
Enriches fuel delivery for critical problem areas
Provides a consistent power gain across the entire power band
Reduces spark retard (knock retard
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There's nothing that would "hurt the car." You'll be fine. -_-