I am about to do this and have all the same fears as Mitch48 did. I need help with purchasing the PCM and the codes on eBay. I platoon having a local stereo place do the install and then off to dealer for the PIWIS bit. One of the eBay dealers seems to suggest that the PCM 3.1 units for Panamera and cayenne will not work on a 2013 Boxster S. Can anyone confirm this?I bought codes from a Russian hacker, he's gone mainstream now with a website, don't remember how many digits. The screen may or may not change, my unit came from a Boxster and the first time it came on showed one, thereafter it just shows "porsche." I don't know about the Ebay sellers, I got mine a few years ago and the climate has changed since then.