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This is interesting. I just installed my Perrin CBE exhaust yesterday afternoon and I'm not experiencing any major drone. It's a little louder inside the car, but that's to be expected compared to stock. You might want to have the installer check everything over because you shouldn't have any vibration in the car from the exhaust.
I did the install myself, and I'm not expert by any means, and I'm not having any problems.
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