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Depends on budget- for under $130 you can get infinity kappa 6.5" speakers which mount with adapter rings.
these efficient speakers make very good use of the meager power in the stock radio.
a 2nd common upgrade is an amp such as the rockford fosgate pbr300x2, with can be anywhere for 130 to 160 on amazon- the above speakers work well with this.
some guys want to spend more on amps and many speakers.
..but the best available sound can be from professional level earbuds ( I use shure 535) wired to the stereo. music in and road noise out.
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