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No i haven't try this chip. One friend of mine has bought a similar chip from amazon (or e-bay) for his 520 diesel and he says that the extra power appeared clearly. He also says that he made some kind of measuring cars acelaration and max speed.
As far as I am concerned, I am thinking serioysly about this chip because it is not expensive and the installation and uninstallation is an easy job. So, I am thinking of buing one , trying it and making a conclusion.
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