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It does come with different levels. They had me try various ones with my first one and it would not work, so they sent a new one. To be honest I can't really tell the difference, so I think they set it on minimum to make sure it worked (this was after several weeks of problems).
Waste of time in my opinion, it'll go on ebay when I can be bothered. I've seen no power gains and no economy changes (in fact it seemed slightly worse after fitting).
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