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vibration or resonance

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Model: cayenne, Year:2011, Mileage:6000, Type of use:Street use only
2011 cayenne turbo, 6k mi.ithis was a dealer demo bought at 5k mi. i have a sort of throttle-sensitive resonance, felt through the steering wheel/column, strongest or most noticeable in the 1500-1800 rpm range regardless of speed but v noticeable at 30-45mph...with or without steering input.i have personally driven another 11 turbo and i think i experienced the same thing, but wasn't entirely sure.i have since gone out with a porsche tech and he verified what i'm experiencing. and we also drove a non turbo v-8 (2011) and it doesn't do it. after a day at the Porsche, they have driven yet another turbo and say that it does it more than mine. so they have declared this 'normal' until further notice.i realize everything has been changed on this car. this property i'm feeling is not pleasant and not in keeping with the overall luxury of the car/truck. also, not in keeping with past porsches. your thoughts and ideas as to whether this is endemic to the new model, or not, would be greatly appreciated. thanks, tom.anyone at all, with the new turbo, observing this?

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