FWIW - I'm running Motive 3:73's in a 12 bolt and they seem as quiet as the 3:31 OEM gears I replaced, but I'm running a 'quiet' gear drive and Flowmaster exhaust so quiet isn't relative to my car.
I've also heard numerous arguments of 3:73's being inherently noisy.
I think it really comes down to who sets the gears up for you. The guy that did mine has over 40 years experience and specialized in drag racing setups in his earlier.