Installed the EFI Silencer last night, today I took it for a 101 mile ride to evaluate it. For my taste and one of my neighbors it is too loud but if fuel mileage stays up I will keep it on. I did notice that the severity of the vibrations have decreased although it could be because of the additional miles on the bike, about 800 at present. My next door neighbor, about 150' from my garage, noticed as I was passing his house and turning into my driveway (going up an incline). Can't go any where here without going up a hill, which reminds me of Army days at Fort Knox, always marching up hill. I wish there was a way to reduce the noise by 50% to keep from tiring me out and upsetting the neighbors.