To my recollection, not sure if this information was conveyed over the phone are otherwise, but Tony said the cabin noise would be slightly less but the tone would be louder. Meaning, a higher dB for sure outside the car, inside the car windows up would be less 'bassy'. I believe the reason for this was the LTH changed the sound wavelength enough to be out of the resonant range, and the car wont vibrate with that deep boominess as much..... or something like that.
