I have an early 99 also I just got my 65hp dd but haven't had time to intall it yet. I am very excited.
Upgrading my TS Performance Chip there tunes are ok, but I have to run the 100hp perf tune so my truck doesn't hold the shifts so long that I eat fuel.
Although I am presently getting 17+ mpg daily driving with that tune.
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E99 F350 , Magnaflow 4" Exhaust , AFE Stage 2 Cold Air, 3.73 Gears, Stock Tires , Transgo Tugger HD2 Repro. Kit with non-pwm apply valve , Landis Triple Disc Low Stall TC manual tc on/off switch, Deep Trans Pan, TS Chip waiting on PHP Tunes, TS Chip Burner. 
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