While I was convoying with my friends out to FFF, I got a call from one of my friends. I was the only one driving out, they all towed their cars (one race car and one unfinished car). Being the middle car of a three-car convoy (I know, not much of a convoy), the friend that called me to tell me that they could hear my Terminator's exhaust over their 7.3 Powerstroke. And, a Powerstroke isn't necessarily a quiet animal. I replied to them, "Really? It's not too loud inside the car. I can hear you over the phone, easily. Ha Ha!" They said they could hear each time I rolled into the throttle to change speed, change lanes, blow someone off the highway....
And, that's with two cats and a full exhaust. But, it sure sounds nice.