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      01-08-2013, 06:45 AM   #5
mmmmQuattro
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Drives: f83 / E93 335 / E70 X5 40d
Join Date: Sep 2007
Location: Adelaide, South Australia

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I think it has to do with the location of the class D amp. It gets too hot.
When I did the upgrade on my 320, I didn't put it in the OEM location under the floor of the boot, but rather where it could get some air.