I'm considering buying a 2003 P5 and I was just wondering if anyone knows what diameter the front and back speakers are? I have 6 1/2 inch alpine ones in my car now which are relatively new and if they would fit in a P5, i'd get them removed first.

 

try a search....

well now that i am here.. i will tell you anyways

5x7 front
6.5 back

i have replaced all speakers in my car, i know the sizes for sure, the back will require some modification but it shouldn't be a problem if you are mechanicaly inclined.. well even if you aren't you should figure something out
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and tweets in the sail panels.

 

And note that you can install 6.5" speakers in the front, even though that isn't the stock size. All you need is to buy or fabricate an adapter. So your Alpine's should fit.