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Old 11th December 2015, 18:28   #2
Jakg
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Join Date: Feb 2010
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What noise are you trying to isolate?

I've insulated my car a lot (mainly for speakers, not done for NVH reasons) and I can't say it's made much of a difference.

In my case, the spare wheel insulation made little difference - I suspect the rear seats act like giant sound absorbers as they completely seal a large part of the area between the boot and cabin.

EDIT - Also I don't think felt is the sort of product you want to be using. You need proper products for the job.
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