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			I make similar adapter.  They just make the install easier but aren't Bose specific.  The dash speakers are 4 ohm but the door & rear speakers are 2 ohm.  You an technically hook up speakers that are any ohm, they just wont sound correct or last and if you push them, they will blow.  It's standard Ohm's law.
		 
				__________________2000 Boxster Tiptronic
 2003 Boxster
 2003 996 C2 Cab
 2002 996 (SOLD)
 1986 944 (gone but missed)
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