The roller conversion increases rocker ratio from 1.76 to 1.8:1 so valves open a little more. If you fit higher lift cam at the same time as most do, unlikely it will be any quieter.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone