What are good sound system to buy (sub woofers and speakers) for my 1964 Mustang?
depends how loud. Honesty I think a 500w RMS sub is great. a single 15 or 12.
or 750w RMS. because being young, you're going to want more bass.
I like RE Audio, Rockford, Kicker, SS Audio's icon series, jl audio w3's. all great subs.
for speakers look for component speakers with silk tweeters if u can get them. I like polk because they are marine certified and durable. I've used polk and mb quart in the past. also rockford has some good prices on their P series speakers which are redesigned last year and sound great