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because you bought an LS. which are equiped with a 118mph rated tires, which is why gm put a speed limiter on your car. if the car allowed you to go any faster, you have a great possibility of blowing your tires.
if you do want to blow your tires and perhaps risk your life, and others, then get a trifecta tune. You can also upgrade your tires, but you still need to get a tune to deactivate the speed limiter.
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