I would never, ever plug something in to an ECU harness whose sole purpose is to fool the ECU/DDE by altering indications it uses to safely control the engine. These devices are not tunes in any sense of the word or capacity. They are cheap, lazy and foolish ways of increasing performance and power. What's available now is a small step above the "chips" that were available for some vehicles on eBay and other outlets years ago. Those "chips" were a resistor that you stuck on the intake air sensor plug thereby inputting a fixed, presumably cool, temperature/resistance to the ECM.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim