Question about 1998 Pontiac Grand Prix
Hello! I think what you are referring to is the speed limiter - which on your car is 108 MPH, and on the GTP it is 126. This is a setting that electronically controlled within the PCM, and the only way it can be modified is to have it reprogrammed, or to purchase an aftermarket, modified PCM.
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Posted on Oct 02, 2009
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Posted on Jan 02, 2017
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