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I have noticed inconsistent sound on my 3 Inch Perrin Catback, though I haven't needed to re-adjust my vband clamps. It may depend on weather/temp of the car. I'm not 100% sure. Everything else is stock except the catback.
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N1rve
2019 BMW ///M4 - Alpine White | Sakhir Orange/Black Leather | M-DCT | Executive Package | 19" Black 437M Wheels | Carbon Fiber Trim | Sunroof | Active Blind Spot | Heated Steering Wheel | Adaptive M Suspension
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