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Everyone has their opinions.
What I would recommend is a system that you can control the valves in the back.
That way you can close two valves when on the phone.
I have a full system w/catless dps and when I close two valves I can barely hear anything.
When its open it wakes people up in a very good European BMW way.
Not obnoxious at all.
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2020 X3M CP - IND Reflector set | Ceramic Tint
Retired:2015 M5 CP MSR Intake|Carbon Fiber Fender Vents|Meisterschaft GTC catback with LXR mid pipes and ER Catless DPs | BPMSPORT Stage II Tune | RKP Rear Diffuser and Challenge Center piece |RKP Front Lip| Painted Reflectors | H&R Springs | Strasse SM5R Carbon Fiber Wheels | Nitto R888 |
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