You are 100% right on the description.

It's not about the person moving in the seat, it's when their weight shifts. on turns primarily. I seem to notice it much more than the passenger or anyone else...

Need 3 people, one driving, one in the passanger seat and me in the back listening and trying different things to make it better, worse or stop.

It does seem to happen more when the temp is lower...

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2008 4.8i X5 (2/25/08) 105k:
Titanium Silver/Black; All -HUD; Aero Kit; 22" VS-130 w/Pirellis;
///M Shifter & Fr Brakes; Gauge Rings; Console Pads; Custom Wheel & Mats; Roof Rails
Carbon Fiber: Int Trim, Nav Surround, Grill, Cluster Trim, Shifter & Eyelids
1.2" H&R; LUX AEs; LCI Tails; Rear Fogs; NBT EVO; ESS Tune; Meisterchaft GTC Exhaust