I have the factory headunit, and would like to add a amp and sub. the headunit is the one where it folds down, so a cd can be inserted, if anyone if familiar with the porsches. I would like to know where to “tap” for the signal on these to run to my amp? from what i hear they usually have rca outputs, but im assuming this one doesnt since its all factory. ??

If I wanted to put larger ones in, would I be able to find a professional installer that is willing to modify the car to fit a larger speaker? For example, if the Boxster can only fit a 4 inch speaker, would I be able to get the guys at the car stereo store to increase the space to fit some 6.5″ speakers in there?