According to this document: http://images.wikia.com/boxster/images/b/b6/Boxster_speakers_update_article.pdf
Speakers of 3" depth or less will fit. I have not tried this myself, so take that with the proverbial grain of salt. You might want to check the specs of the speakers that the author used to see how deep they were.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 12-way driver & 8-way passenger seats, Litronics, silver console
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