Quote:
Originally Posted by cranzy
Just did. Using the same app for before and after.
When idle and the car is warm:
Before: 23-28 DB
After: 18-25 DB
As you can see the DB difference is not significant, but you can hear/feel that the car is isolated and the exhaust sound is toned down/muted.
Anyhow, I'm happy with the results and would recommend to anyone to isolate their trunk if they have noise issues. I would suggest cheaper solution than Dynamat, if you can find one. 
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How about a road noise test?