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A tune will probably run $250-350. I got the Diablosport Predator for my 01 5.3 for $275 shipped. I can adjust for different tire size, firm up the shift, shift rpm, shift mph, injector slope to correct A/F for better mpg, a separate set of settings for the tow/haul mode, etc. It's not as good as a custom tune but it made a difference in mpg and corrected the speedo for bigger tires.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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