M3 – CSL Airbox Conversion Sound Check
posted on: Jul 19, 2008 on category: Videos

This movie shows my BMW M3 before and after I have installed the original CSL Airbox including Alpha-N Software.

You can hear the (outside) sound improvement from before and after the conversion. There is also a small performance increase by doing this modifications. It's defently worth all the money, especially the sound is astonishing.

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