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Thanks for this info. I've received my PCCM Plus and and preparing for the installation in my 1999 996 cab. I only have the basic CDR-220 with four speakers (don't have either CAN or MOST, nor do I have a CD-changer or Bose system), so it appears I have the simplest path. I'm looking at the Porsche installation instructions hosted at NHTSA.gov. Due to a lot of different 996 stereo options over the years, (not to mention the switch to MOST), you have to figure out which parts of the instructions apply to your vehicle. They're not very good at outlining what should or should not be done in my specific case, but thanks to @Larsinexile at least I can see that I don't even need to install the MOST control unit, so I probably won't install the black metal tray either, in order to provide better ventilation to the stereo. I have one part that I need help clarifying - it's about the antenna line. Step 3.1 on page 5 shows a procedure to bypass the antenna amplifier, and it says this should be done on all vehicles without M440. Does this apply to US/CAN vehicles? My initial impression is that this step does not apply to US vehicles because Step 3.1 requires the use of the adapter shown on page 3, identified as item 10, but this cable is not in the US kit (and neither are some other ROW parts like the DAB adapter). The procedure says that this car's antenna should be disconnected from the amplifier and connected to this long antenna cable, which should then be run to the back of the stereo. Did anyone else receive this long antenna cable? Has anyone else with a US/CAN vehicle done procedure 3.1? If so, did you already have PCM in your car? I've gone through all of the cables supplied with it (US model) and the only antenna-related cable is an adapter for the standard antenna wire to the back of the stereo. The procedure doesn't even show this being connected (which is fine, it's almost too simple to bother mentioning), but it seems to me that step 3.1 should be split into an 'a' and 'b' depending on whether it's a US antenna or ROW antenna. I found a video showing this process at 9:17 in the video, but this is a UK/ROW car, and it originally had PCM.