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to expand on this... anyone who says that you can't tell whether a file is stock or not simply doesn't understand computer science. if you have two chunks of information and you need to tell if one == the other, this is always possible. it would be incredibly easy for anyone with the motivation to pull your rom, grab a block of data they suspect you may have changed (a fuel table or something), hash it, diff it, and see if the two are the same. it's really not rocket science, and anyone who suggests that ecutek or any other flashing mechanism somehow protects users from this is just wrong.
if you can get data, and you have some other data you need to diff it against, this can be done, bar none. implementing a tool to allow dealers to do this would be trivial. so yes, if they want to know, they can. whether or not they'll go through the trouble is another question, but it absolutely can be done.
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