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2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
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Pre-SCR NOx sensor would pick that up and use extra DEF to bring the post-SCR NOx reading down back to what it wants. Like I said before.
 

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Pre-SCR NOx sensor would pick that up and use extra DEF to bring the post-SCR NOx reading down back to what it wants. Like I said before.

You’re assuming it can. It’s speculation. Nobody knows if it’s possible because the SCR was never designed as primary treatment for NOx, and at higher concentrations than it would ever see otherwise. It is a secondary treatment after EGR. Do you think GM would engineer the extra capacity to treat NOx at 300% or more of normal in the SCR? I seriously doubt that would be cost effective under current “value engineering” principals used in manufacturing.

You can contact GDE and ask get their input on What may be possible. You can also put pressure on them to develop a tune for the Cruze.
 
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