Saltee

I want a louder, better stereo system all around. have factory navigation head-unit, is it as simple as buying the same size speakers? or do i need other components, not an audio guy, but im an electrician. go figure. any imput will help ! any suggestions on speakers as well

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First ECUTEK tuned Z l HKS race suction Intakes l Custom exhaust l evo-r front lip l shine auto rears l evo-r rear diffuser l Custom housing headlights with LED landing strip (contact for pricing!) Slammed on BC- Br series coilovers