Ive heard of these before too, and the question everyone always asked was how long does it take to push your gas pedal all the way down to get the 5 volts? As you said it doesnt go over 5 volts so it brings no extra power. The only advantage I can see is like a very minimal amount of time quicker to the 5 volts.
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2010 LS3 C6 Silver coupe corvette
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