Unless you got the PCM1 unit with both required factory security codes you will basically be installing a useless head unit. If you have both security codes (and depending on how your Boxster was equipped from the factory) it could be a onerous task to install for no appreciable gain.

 

Just thought i could use only the screen that fits really nice and use only the radio...If that was possible.

 

It's not possible unless you have the factory security codes. If you don't have the codes it's virtually impossible to get them unless you have the VIN of the car it was originally installed in.