Honestly, from what I've been hearing and from my past experience with audio, you will get better sound leaving the stock speakers and replacing the HU, then changing the speakers and leaving the HU. The weak point of the factory system is the HU, not the speakers, which is the case for most cars with shitty systems.
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'10 370z -- '09 Ducati 848 -- '05 Kawasaki 636 Track Bike -- '02 Sentra SE-R Spec V
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