Interesting, also interesting that you're in the 10,000lb+ GVWR class as everything I've read to date specifies 8,500 and under GVWR for smog checking; time to go muddle around on the various state websites again - or just wait for my notice in the mail and bolt the clean stuff back on.
I received a similar letter a few months ago but they only wanted to give me a $50 fuel card and I had to have more than 5000 miles on the vehicle.
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07.5, 6.7, Auto, QC, 4x4, Lots of gauges - ISSPRO (Pyro, Boost, Trans Temp) PriCol Optix (Fuel Pressure Lift/Rail) AutoMeter (Oil Pressure) - Dynatrac Free-Spin Hub Conversion Kit - RETRAX bed cover - homebrew shaved bluetec badge - plugged up EGR - Baldwin BF1212 water separator and CAT 1R0750 fuel filter - MSD Dashhawk - Baldwin B164 Bypass Filter - BD SBS