Just to report back, the polyurethane exhaust hanger didn't change the exhaust noise or vibration inside the cabin at all as far as I can hear.
I only replaced the middle mount to get the pipe off of the cross member though, replacing them all might transmit more vibration. It is harder to get on the pegs, but it doesn't stretch nearly as much as the stock rubber hanger keeping the exhaust sitting higher.
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2011 Nissan 370Z Touring/Sport, 6MT, KAD
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