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I put the MBRP exhaust with resonator on my Raptor with the same results.  I had the rear, side exit version specifically because it should have made it quieter.  On freeway drives myself, my wife, and my two kids all got headaches from the drone.  It was so bad that I didn't want to take the Raptor if we had any other choice.  I tried swapping out the muffler for a Flowmaster and then a Gibson to no avail.  I finally cut my losses and swapped it out for a Corsa and couldn't be happier.  I like it way better than the stock exhaust and have no regrets.  It sounds awesome outside the truck and it's dead silent on the inside.  It's amazing.