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Simple rule: always upgrade from base sound on a BMW. I upgraded to the mid level system (called Business Loudspeaker System in UK) on my F25 and am very glad I did.
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Current 2016 F80 M3 Saloon, Alpine White & Silverstone Full Leather. Love it.
Past 2015 F13 M6 Coupe, San Marino Blue & Opal White Individual Leather. Gone but not forgotten.
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