91 z28 Speakers?

Just bought a nice Z and I'm wondering what type of speakers are in this car stock. No not the size I know what it takes but I guess I'm wondering if upgrading the stock speakers is even necessary (I had thought that there were some decent ones put in these cars stock not sure).

replace em, they're crap, and the 6x9's in the back side panels are a terrible location for sound quality, so I recommend and amp for them and also maybe adding some 6 1/2's in the doors

oh yea, and to answer the question on the type, they're Delco brand, paper cone speakers.

Oh ok I thought some model came with Bose but I have no idea. My friend has my old pioneers in the front and back with an amp and my old 12" earthquakes w/ 1200 watt amp its amazing to sit in that car and hear the system (pioneer headunit too). I think I'm gonna model mine off that I never liked the speakers in the doors thing but I guess it would sound even better.

personally as far as 6x9's are conserned I think the boston acousitcs rm-9 are the best. Along ith there proseries subs. Thats what the buick is getting this winter along with a pioneer DEH-75000MP head unit