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mikkhh

The way most of these "demans" are done are just by blindly editing ecm files, most likely they just even edit program run code, there are no proper definition files on the internet and ALL of these demans are no good. Most of butchering is just deleting fault codes. Same story with just driving the truck with plugs disconnected, it will end up in limp mode sooner or later.

Logic behind the operating modes and so on is just like on red engines. There are also auxiliary emissions fall back methods so the engine tries to clamp down on emissions by reducing torque, by using way way more timing advance to achieve more complete burn and therefore less emissions, all that comes with the price of REDUCED engine lifespan...

I know from Benz cars (by flashing software on ecm) that there are usually three parts to ecm software - bootloader, calibration and dataflash besides the eeprom (usually vehicle specific settings and immobilizer data are stored there) part that usually never gets flashed during software update. The bootloader usually never gets touched with dealer flashing tools. If somebody edits that part update at dealer will not write it over. Sometimes when ecm has been flashed over there are people who lock the programming (so others would not see what garbage they have on there) so it is not easy to flash over ecm by normal means. Also some big name tuned cars that have their added power update registered at Germany officially do the programming blocking route. Now those same 10+ year old cars have emissions mandatory recalls to flash over ecm at dealer, but ecm is not accepting updates, car will not pass yearly inspection without the recall being done. Used ecm swaps depend on plain luck whether manufacturer approves or not, need to wait up to a month, new or factory reman costs the market price of 2008 Audi A6 usually.