I applied deadener to the plastic panels as well, but I also used 3/16 weatherstripping to the outer edges of the panel where it meets the steel door skin, as well as making "washers" out of it around the push fasteners where it met the steel. Time consuming, but solved the problem for me.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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