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For me the external links looked very much like advertisement because of all the buy options on this websites, so I removed them.
The text for the ecutesting for example says as you can see below testing & technical information but I could only find price lists and repairing options with telephone numbers of the garage at the first glance. Also www.qualitycustomparts.com doesn't sound like a link where you can get information about ECUs in general. A bit like writing an article about cows and posting the link to my favorit steak restaurant :-P