I also received this recall just today and actually created a new thread myself (in Engine & Technical). I suspect, like you, that the idea may be to reduce engine output as the potential fix to the emissions issues that prompted this recall in the first place. If that's true, I may also decline since I've actually made some changes to improve engine output and efficiency and I'm not interested in relinquishing those improvements to get FCA into compliance. They may have to get there without me unless I can be convinced that output will not be compromised. We'll see.