Or take the amps off the old speakers and mount to your new ones, easy and no messing with the wiring or a new separate amp. Also, this way you get to maintain the 2 little door tweeters, which I find do not hurt sound quality. I have been running this way with an aftermarket HU for years and it goes PLENTY loud for me before any distortion occurs. I specifically remember trying to run the speakers just from the HU pre-outs (I think standard 50w) and bypassing the amps, and it did not sound nearly as good or loud.