Thought I'd chime in with my system. I've got a remote controlled valved system by Bulletperformance Exhausts. With the valves closed it's quiet, even more so than stock would be and absolutely no drone. With the valves opened, it's insanely loud! So it's got abit of a jekyll and hyde syndrome. It's significantly cheaper than most valved systems so that's a big plus. An RCF system typically costs less than $2,000.00.