A help, definitely, but not a necessity.
Although I'm all for upgrading any stereo system, it will sound just fine without an amp if you chose not to use one.
Your best bet would be to install the speakers, and give it a listen, then decide.
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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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