The o-ring on the compressor outlet, the hot-side boots, the intercooler end tank seals (if you have a plastic-tank intercooler), the cold-side boots, the boots at the intake plenums, etc.
Drive pressure leaks are really common where the turbine inlet pipes merge into the collector. It's a design flaw....nothing wrong with the truck. If you see soot where the pipes merge into the collector at the back side of the turbine housing, then plan on buying new pipes and donut seals.
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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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