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					Originally Posted by geraintthomas  Unfortunately you're going to be in a lot of pain installing a double din f you have the bose system with an amplifier. You may have to replace a lot (amp, speakers, etc). Have a little look on google at people who have tried a similar thing, it's very difficult! | 
	
 
2003 and 2004 Boxsters have the M.O.S.T. (is the least) fiber optic bus for the stereo.   I don't know what that means, I just know my 2003 has it and I believe there is more re-wiring to replace the head unit.  It has been done though.  Crutchfield stereo may have some good info on their website.