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The e9x m3 was unique and only matched by the e46 csl in terms of sound from the engine. The intake on the m3 has a gaping hole out the hood allowing not only airflow at higher rpms but the sound can come screaming out from that giant square/round filter and a huge airbox with no baffling or hemoltz chamber to quiet it. Has 3 air intake paths and the amount of air and the speed at which it gets sucked into the engine all be broadcasted out the hole in the hood makes for an engine noise that is largely unmatched.
The open filter csl intake had great sound but not as loud as the e92 m3 in terms of engine sound
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