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While building mine, I tried to add soundproofing at places like the trunk floor since I expected some noise problems like yours. I used Dynamat on the back of the floor panel before I riveted it in. The stuff is designed to dampen out noises like this, so it should do a good job. However, with my engine running, I've never been able to hear much of anything!
I surely hope you don't have the broken baffle problem. That will be much more trouble to fix!
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