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Yes I agree it is mostly by adding fuel. The downside of the wide band route is that it doesn't really have much affect outside closed loop simply because the ecu doesn't look at them. Maybe not a problem for yourself and a lot of other riders especially on a big GS that isn't exactly a race bike. For some users though the retune is better if they are on the WOT a lot, generally driving hard. It's all preference and many will scoff saying it's not needed and a waste of time and money, others will see it as life saving and worth every penny/cent.
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