I have a 1998 986 and it only came with the 4 inch dash speakers (why I'm not sure). I replaced mine with the JL Audio TR-400 CXi and they sound great
JL Audio TR400-CXi 4" or 4" x 6" Evolution TR 2-way Speakers . You want to stay away from a really harsh sounding tweeter because the sound bouncing off the windshield will only amplify it. I paired my new dash speakers with a nice set of 6 1/2 inch Focal IC165 which I put in my doors and they sound phenomenal
Focal IC165 6-1/2" (6.5") 2-Way Integration Coaxial Car Speakers . Just my 2 cents
