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Should see slight egt reduction and slight mpg increase. Depending on your driving style. When my 96 was stock going from the 13 to 16 gained about 1.5 mpg for me. I didn't have a pyrometer at the time but as you advance your timing you use more heat in cylinder so it normally creates both of the conditions listed earlier. I tried 18 degrees stock but was not happy with turbo spool. I now run around 20 degrees with my current setup.
96 3500 5x018 7mm dvs 62fmw
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1996 3500 4x4 5spd
1991 D350 5spd
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