Had a shop for 40 years and installed many Borla systems, all were very quiet, but they do seem to have a kind of break in period, when the system drys out from the heat and all the lubricants used for packaging and storage clears out. Will it get louder, maybe a little. Borla makes different levels of systems some louder than others, I think they make only one system for the Viper. One good thing I see you live in CA everyone will think your driving a electric car and be very happy with you.