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...or install a CTS2.
 

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Exhaust sound will be different when it is in regen.
Idle speed higher.
Fuel economy reduced.


Idle can increase for reasons other than regen.
 

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...or install a CTS2.
and if you watch the inj. timing ,you'll see it drop to ~-10°,this happens before the cts2 will say regen has started.at least on my 2016.other years may be a bit different.
 
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