Rear speakers in standard audio Boxster?

[Giller]

And we are back to suggesting - use the search function. There are a dozen good write-ups on how to wire up a new sound system. If you are half-way knowledgeable, these cars aren't any more difficult than any other car for wiring sound. If you aren't, then take it to your local sound guy and get him to do it.
It's not overly complicated if you are looking for a simple upgrade.