Do you need a string silencer? Have your buddy stand about 10 yards away, if they are hearing something, then go for it, if not why bother. String leeches do not last long on my Maxxis 35. It seems anything that must by weaved into the string, including the factory silencer is gone after a couple hundred shots. I actually put cat whiskers on about two weeks ago to get rid of little string twang that i heard. I honestly don't think they are going to hurt your speed that much.