If you have HiFi 676, then something in the MOST loop wouldn't really be needed, you're analog to the amp. Aftermarket radio may be your best option and easy to do with HiFi.
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AC Schnitzer/Eibach/M Performance/RaceChip/Compustar/Drone/BimmerTech/FireTV/Helix/Dynaudio/Micro-Precision/Jehnert/Audiomobile
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