I recently bought a 1995 740il. The previous owner told me the car has something like 13 speakers. I want to re-do the audio system but do I really need to replace all of the speakers, which least to say would be very costly? Also I'm thinking about running two 13 inch JLAudio W7's so I need significant trebble. Is there anyway around replacing all the interior speakers or am I out of luck?

Any suggestions would be very appreciated. Thanks

Peace