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Factory Sound Dampening

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I've got a 99 mustang that I'm planning on installing Second Skin throughout, however as I removed the trunk panels and carpet I noticed that the factory had already installed some dampening. My question to you guys is; is it worth the trouble of removing the factory dampening before installing the Second Skin stuff or should it be okay to just lay the Second Skin over the top of it?



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Lay around it. Doubling a layer is diminishing returns. And if it's like most factory stuff, it's not coming off

2014 Ford Fusion SE 2.0T


Zapco ST-4X SQ, ST-1000XMii

IDQ12v4 1.8cu sealed

Alpine SPX Pro ring radiators

Hertz HV165XL

Knuconceptz OFC, Custom fit Soundrive RCAs.

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Cool, thanks for the info. While I'm here I might as well ask another question. Is there any benefit to applying sound dampener to the inside of the doors or will it cause issues with the window mechanism?

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