To anyone who wants to upgrade? Probably nothing.
To someone who already has the BOSE and needs a replacement HU - $100-$200 maybe?
The BOSE system is not that great to begin with (and I have it in my TB). It came with the 6 disc changer for me, so that's why I have it. It is decent enougt for a stock system, but IMO certainly not an "upgrade". Maybe the earlier versions with the older amps which I have heard sound alot better, but not in 2006.
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