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I think Dinan makes something but it's Dinan so expect minimal gains and a huge price tag.
There isn't anything else. If you understand the path of the airflow on the N63, you will figure out why.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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