I replaced the stock door speakers in my 1998 Porsche Boxster 986 with Focal speakers today. I also replaced the dash speakers and have a separate video for that.
These are 4 ohm speakers and the stock are 2 ohm, so an upgraded amp is needed. I will have a separate install video for replacing the stock amp with a new 4-channel amp.
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5-1/4″ Focal Speakers: https://www.crutchfield.com/p_091ISC130/Focal-Integration-ISC-130.html?omnews=15391280