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There is nothing "cold air" about that intake. Plus, it appears to be just their original intake modified on the back-end for the MAF sensor and plenum tubing size.
Based on the photos, I would bet the bottom of the intake does not maximize the airflow from the bottom intakes (there are 4 intake ports on the E60 M5). Just look at the carbon fiber housing surrounding the filter.
Cheers,
Darren
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2008 M5 Interlagos Blau 5.7L Stroked
2008 X5 4.8i Alpine Weiss
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