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Weird. My Perrin exhaust doesn't drone very much at all, my wife actually commented that it wasn't louder than the stock exhaust at cruise. The stock exhaust had as much drone in my car.
If you've had it on for awhile, take a look under the car and see if any of the connections are leaking. If the shop was sloppy, they may have incorrectly tightened the v-band clamps... mine were a little tricky to get lined up the right time.
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