Will the HU improve your sound quality? most likely. Do you NEED an amplifier? No, but you would certainly benefit from having one. More power is never a bad thing, especially with the road noise in the Z. A small 4 channel class D, using the HU crossovers. 2 channels LP to your doors, 2 channels HP to your dash. (through your amp, of course)
Nowadays power is cheap, why not take advantage.
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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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