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My guess would be the exhaust valves. It doesn't make sense for it to be suspension related as you are also experiencing it at stationary.
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2015 BMW F80 M3: ProTuning Freaks Flash Tune / Eisenmann Downpipes / CSF Heat Exchanger / BMS Charge Pipes
2007 BMW E92 335i (SOLD): BMS JB4 / Quaife LSD / Riss Racing DPs / Helix Intercooler / BMS Intake / STETT Charge Pipe / Forge DVs
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