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Re: My 2012 GMC Sierra
When I bought my 2011 GMC, I found that the 93 MPH cutoff had to go. I now have changed that to a point that it does not interfere with the operation of the truck. The 5.3, with a six speed tranny is a good mix. A set of headers awakens the monster in the engine. Mine is a standard cab truck.
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Frank
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