[vr986]

Been trolling looking for answers on the topic of stereo upgrades for 2003 boxsters (regretting Porsche's decision to go optical, thus locking out practically all aftermarket solutions). Now trying to judge the feasibility of upgrading a 2001 boxster's rear window to glass (the reason I've been consider the 2003). Have accumulated enough info that I can actually offer an answer of my own...

Regarding the mystery of the rear-defrost switch on a plastic-backed Boxster: it's there because all hard tops have the defrost. Take a look in the left rear area, behind the driver's seat (US) -- there should be a little pigtail into which you'd plug the hard top's defrost harness.