From what I found out from the newspaper, there is a cat that has a very loud purr that is measured at roughly 90dB and I'm not kidding. The cat's name is Smokey and she can purr as loud as a Boeing 737 coming to land
She is also honoured a world record for having the loudest purr, and you can read more about it here.
I should say that the cat's purr is so loud that you can't have a phone conversation when she's there

I should say that the cat's purr is so loud that you can't have a phone conversation when she's there
