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Hi Mark,
Any radio replacement will cost more than $250 because of the MOST bus system. You either need to completely remove the BOSE system and replace the AMP, HU, and speakers or try to find a MOST conversion which there doesn't seem to be at this moment. I think the estimate is more like 500-1000 to upgrade the system.
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Current: 2004 Boxster S 550 Spyder Anniversary Edition (BSSE)
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