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Funkle,
How about trying to sound deaden the doors first? Made a huge difference on my 2.5i in terms of stereo quality. I'm guessing it will still make a big difference on the 'Coupe.
Plus, it's cheaper and has the added effect of lessening some external noise.
Con: Adds weight.
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2003 Z4 2.5i
2013 FR-S
1990 911 C2
1983 Wife
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