Injectors, larger high pressure oil pump, and tunes to run them.
It shouldn't be too hard to lay down 350 RWHP with the right combination of parts, but 250 RWHP is about all you'll get with stock injectors and good tuning on an early PSD.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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