I have a 99 base with the M490 option. I recently replaced the dash speakers and door speakers. Door speakers are 5.25 I believe. Replaced the amp with a 6 channel from a 996 cabrio, added 6 speakers to the rear storage deck and a DD HU off Ebay. I have an aftermarket muffler that is loud and at 100mph with the top down I can hear the music just fine. It is a worthwhile upgrade!
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99 Porsche Boxster
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