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Thanks for your input guys! I got it to work. Took me 5 hours last night from start to the first "guided ride". It is not that complicated just time consuming. PLUG A Head Unit and Antenna My biggest concern was where to get the speed - and reverse signal. What a nice surprise, when I found out that they are already present in plug A. They are just not used for the optical system (according to the CDR23 pinout). The only wire missing is a switched 12V, which I took directly from the Ignition Switch. The Antenna Plug does not fit so I used EU-10 and VW-20 Adapters from installer.com http://www.installer.com/item/display_item.php?it=40-eu10 http://www.installer.com/item/display_item.php?it=40-vw20 PLUG B - Speakers First I routed new speaker cables from the new head unit to the front trunk. The stock amp has to go, whats left are two plugs, one for the MOST sytem and the power / speaker plug. As the MOST plug is not used anymore, I wrapped it with electric tape and tucked it behind the brake fluid reservoir cover (careful here - do not bend the glasfiber to hard). Looking at the power / speaker plug there are round female plugs where the speaker out cables from the new head unit have to connect. In other words, you plug in the stock harness at this point to connect the speakers. This saves runing new wires to the speakers. I used 2.5mm miniature banana plugs which fit pefect http://www.newark.com/jsp/Interconnect++Pr...jsp?sku=94F3887 The sound is a little "thin". The stock amp makes significantly more bass than the 4 x 18 Watts integrated amp. I need to see whether I get used to it. It can be done!

I'm about putting a Becker Traffic Pro into my 03 Boxster. Due to the help of this forum I now know that I need to hardwire the new unit. Could somebody give me some directions with the following, please - where to pick up the speedo signal - where to pick up the reverse signal and where are the speaker cables? There is no plug with speaker cables going into the CDR23 so I guess they are somewhere at the amp (non Bose) in the front trunk. What are the colors of the cables or the pin out of the amp? Thanks a lot in advance, any help would safe me a lot of measuring and searching! I promise to write up a DIY after its finished.

Thanks a lot guys, I think I go with a tom tom or something alike and try to intall it nicely in the center console.

Thanks a lot, Loren :thumbup: ! So to hardwire means that none of the existing plugs can be used?

Hello all, just joined the forum, what a great source of information. I bought a 2003 Boxster last week and I love this car. There was no code card with the radio, could somebody help me with the code? Model CDR 23 Model Number BE6612 Serial Number 25020179 Thanks! Another question, would a regular Becker Traffic Pro fit as a plug and play or are there problems to expect with the BUS System. I have no BOSE sytem, but I do have an amp in the front trunk.