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      02-24-2011, 09:49 PM   #47
rzm3
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Drives: E92 M3
Join Date: Aug 2007
Location: USA

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The reason why I chose a card board material + felt is for noise absorption. If you use any type of thinner, stiffer material there may be a lot of vibration. I've been very happy with mine.
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E92 M3 DCT - AiM EVO4 Data Logger / AiM SmartyCam HD / KW Competition 2-Way / OMP ARS Racing Seats / Brembo GT 365 / Pagid Yellow RS-29 / Rear Seats Delete