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How level does the surface have to be to get accurate numbers from the VBOX?
My G-Tech gives dramatically different numbers if I am going uphill or downhill. It reads higher going up a hill. I know that the VBOX is to the G-Tech what a machine gun is to a dart gun, but I am curious what is required for a test setup.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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