This happened to me...I'd gone over a fairly serious railroad track, and about 30 mi after started noticing a light 'wup-wup-wup-wup" noise coming from the front tires. Went to dealership: Bent rims up front. Fixed, but was told that because I'd driven the tires on them for about 100 mi (couldn't get the car in immediately), that the sound might no go away until I bought new tires (which, due to lack of wear, the SA did not recommend, stating I should be fine); sound went mostly away, but if one listens REALLY closely one can hear a brief noise...
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