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Have a gtus with a vert wheels with tires of 205/55/15 my MPH is off by 4-5 mph. So 70mph on the gauge is about 65-67 mph according to my GPS. LOL. grr I need 16's ! I would agree when the car was completely stock the rpms would be off give or take a few 100. As long as its in spec of the FSM it should be alright if not. Happy hunting for the problem.
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Currently running:
90 GTUs converted to S5 TurboII. Track car.
90 N/A GTUs..
Running project car
89 N/A GTUs in Black #2
10/6/18
Blown coolant seal undergoing rebuild and restomod.
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