For comparison, I just returned from a Bronco Raptor highway pleasure run, according to my apple watch I was at 72db at 75mph, 74db at 80mph, baja exhaust, 10th gear on a concrete freeway. Expecting the sound level to go up when I get the SPD downpipes installed, which I think the exhaust is a good noise, road noise that you deadened is undesirable noise. What I've read is that vehicle doors are the major contributor to road noise inside the vehicle, which helps explain how the db level was significantly reduced for you.