The swirl motor apparently, is only used at low revs for emissions reduction,.
Some people have been known to unplug the electrical connector, located neear the turbo inlet, and insert a resistor. This fools the computer, into thinking the swirl motor is o.k.
Another thing worth checking, is that the turbo inlet pipe, is the all black update one. Not the one that has an orange seal at the turbo inlet.
Google the info, it is well reported on most jeep forums.
I have to head out, otherwise I would chase up some links.
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