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The 8" subwoofer is driven off the surround-sound amp. If you want to upgrade the 1LT sound system to the 2LT sound system, you'll need that amp. The rest of the speakers should be the same.
What I don't know is if they use that same amp in both 1LT and the 2LT/3LT. If it is, then you'd pretty much just need that trim piece, the subwoofer, and whatever wire connections they have.
Something to think about, though, is that the back trim piece that is different for the 2LT version also houses the electric venting system. So if you replace that trim piece to include the subwoofer, it's probably going to be a complicated upgrade.
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