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I would be very skeptical about any of these. I have read independent magazine tests and none of them add horsepower. Many reduce horsepower.
Think about it - if BMW could install something similar to this and increase it's fuel mileage ratings to meet EPA requirements - and give us more horsepower - don't you think they would? You know the part only cost about 50 cents to make.
In my opinion, it's money down the drain. Buy a nice set of floor mats to keep your beauty looking its best and increase resale value too.
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