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With modern diesels fuel is what creates HP.
The extra air is needed to control smoke by fully burning the fuel, creating more go.
I see he is next opening the exhaust. I predict there will be gains but they will be minimal.
When they change to larger injectors and adjust the idle, stand back ! I hope his tranny can handle it.
Properly fuelled they will rip their tranny apart. First the differential goes. Then after you drop $$$ on a Quaiffe or Peloquin, you'll be good to 140-150 before other things start going.
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