Why bother getting the Alpine upgrade when you can get great sound without too much trouble and cost. Buy a JL Audio xd600/6 amp, get a Quad Lock connector for the HU (or reuse your existing one) and run a 9 conductor cable from HU to the AMP. Then run 6 channels from the amp to your brand new front, subs and rear speakers.
I'm over simplifying but it can be done for a little more than the Alpine upgrade. Especially if you do it yourself. You do need to get the HU reprogramed to HiFi.
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