I have the testimony from Cullen about the Magnaflow that came on my Raptor. He said that under throttle getting onto the highway, running down the road in front of him, etc that it sounded wicked/mean/tough. But there was no drone at all. I was impressed. Even with the radio turned down I could barely hear it in the cab. Of course, with the subs cranked, I didn't hear the exhaust, the road noise, my phone, etc....lol