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wnta1ss: Not sure if any speedometers are accurate at that speed. I would rely on a GPS read out. Interestingly, I've already noted the 158 max speed with HP Tuners. I ran into the same thing with my 96 model LT4 Corvette and Autotap logger - not sure why they do that.
A question I haven't seen answered is if the PDR speed is more accurate (or the same as the speedometer).
Thanks for the post.
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