Audi A6 C7 Door Soundproofing (Best Thermal Insulation)

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Today I will show you how I soundproofed the doors of the Audi A6 C7 + the temperature test!
This modification is worth doing to any car!
The advantages are the reduction of running noise + much better sound and a deeper bass when listening to your favorite song at maximum volume + the temperature being much warmer in winter and much colder in summer!
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