Have you considered an aftermarket system?
I have an '01 Boxster with the factory Hi-Fi system (amp in trunk, dash and door speakers, CDR220 head unit). I was very disapointed with the sound quality of this system but really liked the factory look.
I did some research on the web looking for ideas on replacing what I have. I had a couple of constraints. 1- I wanted to retain the factory look as much as possible and 2- I didn't want to break the bank.
My search lead me to a company called Car Audio Innovations out on the West Coast (I'm in Mass). Looking at their web site (
http://www.caraudioinnovations.com/)(1-800-892-6430) it was clear they did a lot of work on Porsches. I gave them a call and spoke with the owner, Rod. What a wicked nice guy Rod is. In fact his entire team are just awesome.
I shared with Rod what I was looking for and he helped me put a system together that didn't break the bank and looked VERY close to stock. And the quality is 100 times better than the factory system. It's better than I could have hoped for, and I did all the work myself.
Rod sent everything I needed from the gear, wires, connectors etc. all the way to printed instructions with pictures for the install. And the bet part was Rod was always available via the phone when I had questions, and I had a bunch!!
Not sure I've helped you at all but you might want to touch base with Rod and see what your options are. Tell Matt in Mass sent ya!!
All the best.
Matt