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Old 12-24-2012, 07:44 PM
cblandin cblandin is offline
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Location: Dallas
 
Join Date: Jul 2007
Posts: 129
Mein Auto: Traded M5 for Volt!?!?
A layer of luxury liner pro from these guys might help: http://store.secondskinaudio.com/

I would NOT do the damplifier or dynamat space capsule bit - that stuff is really to quell vibrations in metal and does little to block airborne sound. The heavy vinyl on open cell foam is much more effective and mirrors what manufacturers use more closely. When I tried sound deadening my old '05 GTO it was actually most effective on exhaust noise (more so than the tire/road noise I was trying to reduce). I think hatchback style cars like the X3 are even more susceptible to noise.
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