Yea ur right, but I actually do have a rumble for some reason. Pretty nice and got even better with hogzaust. 4 washers is great to me. Love how when I'm in park I can hear it have a low and very deep rumble, soon as I shift into any of other gears it transitions in sound almost like a manual. Neutral makes it an even deeper tone. Pulling up to a stop sign or red light in drive makes the car insanely quiet, even quieter than it was without hogzaust and littler sounds like it's off from inside the cab until I touch the gas and it roars