The ads say it will make your car more fuel efficient. I don't buy it. The only realistic way it is possible is the fact they say it is maditory you use premium gas once you flash or alter the DME. Good gas burns better and will likely increase your mpg slightly. As for you OBC reading, you are proabably just going down hill :P
I wouldn't recomend taxing your revs constantly. BMW makes enthusiast cars made to be driven in a spirited manner, but wanking the revs to redline through each gate will certainly shorten engine life. Have fun, be responsible.
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