Just got the radio in my '88 Targa and it's pretty great. The PO had put in a good quality JVC aftermarket head unit, but it had a CD player and old-style iPod connector instead of bluetooth. I didn't especially love the look relative to the car, and the buttons were the small, fussy, late 1990s aftermarket ones.
Here's how - this is a GREAT DIY project. I looked for recommendations for a 911-matching reasonably priced radio and PabloX here on the forum suggested the Kienzle MCR116BT
http://forums.pelicanparts.com/porsche-911-technical-forum/863241-bought-new-head-unit-my-86-coupe.html
Having no US dealer I used the InterTubez to order from Amazon.de. That worked great, but I did have to have a chat with my credit union about how the fraud computer shut off my card for suspicious activity :-).
Here is the "after" shot in the car.
