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I would not be surprised if the PCM system in your '04 Boxster is too outdated to communicate with the current cellular system. In eleven years a lot has changed. That said... hopefully someone with experience with these systems can chime in.
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1995 Porsche C4 Cab
2016 BMW M2, 6 Speed LBB - ED 7/2016
1997 993 Cab - Sold; 1997 993 Turbo - Sold
2001 Boxster S - Original Owner - 30K Miles -SOLD
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