I thought the radio was a MOST system on new boxsters, meaning all the wires going through the unit are fiber optic. In that case, there is no way the head unit could be easily swapped, with or without a dash kit. Of course the Bose ("Blose") also uses an amplifier that you would need to get signal to. And finally bose speakers are all low impedence (1 - 2 ohm), too low for the alpine unit to be stable. Most car audio speakers operate at 4 ohm. In order to upgrade to bose system, you basically have to replace the entire thing, which is not going to cheap no matter what components you use.
Porsche has really mucked it up with the audio systems in their new vehicles. No mp3, no ipod, horrible sound quality, and expensive to upgrade. Then again, if they're going to get anything wrong, i'm glad it was the audio.
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