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In past BMW’s that I have owned, sedans, coupes, a SUV’s; I have gone with JL subs and PPI amps. I have had everything for single 8” to 3 12’s in a suv. Granted the 3 12’s performed better than most clubs. Unless you are looking to spend a shit ton of money upgrading mods, highs, sub etc with quality amps speakers; I’d suggest an 8” quality sub in a sealed box with a quality amp to power it. Much like performance mods, once to start, your pocket book is the limit.
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