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3 things:
1. Remove rear speakers so the pressure in the trunk can escape.
2. Deaden your trunk. That will keep the pressure from leaking out of your trunk or causing flex (which causes reduction in spl).
3. Put your subwoofer right up next to your trunk lid, facing the trunk lid if you can. This will help eliminate any wave cancellation since the backwaves and forward waves will be overlapping and "together" rather than separated and canceling each other.
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