thank god you didnt ask whats the best lol 1st upgrade and the most critical is the hu. aka get a good one. forget jvc forget dual forget audiobahn. get a good quality hu, alpine pioneer kennwood eclipse etc 2nd speaks get some nice coaxls where need be and componets whenever possible, avoid oval speaks if you can and try to stick with round ones. infinity kicker eclipse jl audio 3rd look into a nice 4 channel amp for your speaks, you could spend alot but honestly id go kicker, they are cheap and underrated and very good quality 4th if your not into major bass look into an infinity basslink sub. its clean and has a built on amp so no need to hassle with wireing an amp up too
LOL!!!!!!!!!!! Caddy Boy!!!!!!!!! ( btw whats the best stove top stuffing?) wish I could remember what those cars even looked like! But, a nice set of components up front, a set of coaxes in the rear, driven by a quality 4 channel amp would make a nice start. A new HU would make things even nicer, i like the clarions and alpines lately, as far as sub bass goes, what is your poison? music wise anyway....and you want what? SQ or SPL??? or both?
like this... or like all of these in my garage haha the middle ones my moms 96 Sedan Deville Concourse the other two are mine a 74 Eldo Convertable and obviously a 97 ETC (Eldorado Touring Coupe)
