A 12 dB reduction? Running identically powered 250 SLX bowriders, one with Quiet Ride and one without, I recorded a 9 dB(A) reduction in noise at 4,000 rpm while seated at the aft bench. The actual readings were 92 and 83 dB(A). Note that we had less wind during our trials than Sea Ray had during its tests. We also used a different brand of sound meter, which might have affected the results. Still, a 9 dB reduction is outstanding: the average sound level for similar boats at that speed, according to our test database on our website, is 94 decibels. Additionally, the boat without Quiet Ride produced a three-cycles-per-second thrum in the soles of my bare feet. Aboard the 250 SLX with Quiet Ride I could not feel enough vibration to quantify it.