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I've researched this a bit and from what I've read it's not (easily) possible to retrofit the Alpine kit if you have the Hi-Fi system, as the Alpine kit is designed to replace the standard system.
I've also read that the Alpine is not as good as HK.
My impression is that it's only a little bit better than Hi-Fi, so in your situation, I think you're better off either leaving it alone or taking it to a dedicated audio shop for some serious upgrades.
But this is all based on hear-say, so...
Good luck!
- Rick
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