If you're running 19s there's a good chance they'll be running nice wide rear tyres which create a nice amount of noise - noticed it going from 225s to 255s on mine. I personally don't think the RFTs are any noisier than standard tyres, rolling noise, although they do crash more through pot holes. Do you know what the tyres are? If you've got asymmetric tyre they'll be a bit nosier too, in my experience.
All of that aside, these aren't the best cars for keeping out the road noise, as has already been mentioned.