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I would say that if you want a nice and deep sound that doesnt make you deaf go with M5/M6 mufflers. Their sound is subtle at low rpms and during acceleration they make you believe you are actually driving an M car. They fit without problem and makes your ride look more agressive with their quad tips.
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CQuartz UK 3 Ceramic Coating | GeoShield Pronano 50% Ceramic Window Film | M5 M Perf Steering Wheel | M6 Comp Pkg Mufflers | M Perf Floor Mats | CF Spoiler | RW CF Quad Setup Diffuser | RW CF Front Lip | CF Trim | BMW Interior Leds | M5 343 Wheels | Pure Stg 2 Turbo |