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I've read it's an ongoing issue with Variable vane turbo's? The limp mode you got its probably low fuel rail pressure from your truck not keeping up with the desired rail pressure. It's a standard thing with tunes as they start producing more power 😋

Fixes with bigger tunes are;
PPE ported fuel rail fitting
PPE race fuel valve
Lift pumps.

I've got compound turbos with a 4094 stage 2 in the valley and occasionally I still get this. My tuner said its kind of hard to pinpoint if I remember correctly.
 
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