I've had my Toyos for about 20k, been rotating them every 4 or 5k (bought them used) and mine definitely have not gotten louder. I have noticed the rear passenger tire is deteriorating on the side wall a bit, chunks on the side have ripped off. What PSI are you guys running them at? I overinflated mine and wore them down quicker than I expected, so I'm trying to find the sweet spot for this new set I'm buying soon.