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When you're next to a hard acceleration truck and crack open a window, notice that even the tiniest opening lets in 90% of the noise. Start by sealing up any gaps where factory grommets and seals have degraded over the years.
Second thing I realised about sound proofing is that you'll always be limited by the car's glass, most of the noise in my Renault comes in through the large areas of glass, sound proofing the rest of the car is of little value, unless you have a specific problem.
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