You would definitely feel it if it were defueling. With a stock turbocharger and high pressure oil system, these trucks really fall flat on their face after 2500 RPM anyway.
If you get a mechanical pressure gauge and temporarily install it, you can see what the truck is actually doing.
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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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