Originally Posted by 2009RavenR1
You should look up for an SCR works waps... The SCR has ZERO impact on how the vehicle runs.
Sorry Raven, but it is not that cut and dry. What you say would be true if it was a non-SCR system and somebody added a third party SCR to it at some point (like a Tier II certified generator set that somebody added a SCR system to in the field to comply with local regulations for NOX output). In that case the third party SCR would have no virtually no impact on the performance of the engine, other than adding a bit of exhaust backpressure.
But in the case of our Jeeps, and other similar on-highway vehicles, the EPA holds Jeep accountable for making sure the system is tamper proof and remains in operation when the engine is in operation. The control software knows what is going on in terms of pre/post SCR NOX levels and will no doubt manipulate EGR flow accordingly.