RedRam...
SMARTY leaves that code on all trucks that I have seen so far... It is no problem! The code is reset when you restore to the stock software (which should ALWAYS be done before going back to the dealership!) Once restored to stock software, since the code is reset, stealth mode is returned...
The reason to always go back to stock when you go to the dealer is that if they reflash your ECM for any updated DCX software, it will destroy the "relationship" between SMARTY and your VIN... SMARTY can be manually unlocked, BUT ONLY ONE TIME so you really don't want to take a chance on it.
Also, as far as I know, the "undetectable" part of SMARTY is only assured when you return the truck to the STOCK software...
Thank You I Feel Safe, back to Smarty test and tune