it is really going to depend on your budget. Something to mount in a console door or kickpanel. You really dont have much room for what most people think to be a conventional subwoofer. Even 8" woofers are too big for those applications. I would recommend JL Audio if you want a good sounding sub. their base isn't overhwelming its nice and tight. If you just want to upgrade component speakers, I would recommend spending some money and getting FOCAL's they are great component speakers. If you are conerned about SQL not SPL Invest in an amp that has adjustability.
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