Quote:
Originally Posted by Julesandtrish
..... I must say that every time the ERG comes on to burn the NOX gasses while I'm driving the exhaust sounds much more noticeably louder.....
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OK, just so you won't feel all alone. But this won't answer your question. Honestly I have never experienced/noticed anything with respect to the quoted item above. How would I even know this was happening? I have close to 10K miles on the odometer. Once in a while it gets a bit noisy when I have come back home and parked it in the garage and turned off the engine.
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2021 X3 M40i: M Sport Differential, Adaptive M Suspension.
Previous BMWs: 1971 BMW 2002, 1973 BMW R75/5, and 2011 BMW 335d
Previous Other Vehicles: '67 Cougar, '70 911e, '86 Jetta Diesel, '05 and '12 Foresters, et al.