I originally went with the plain steel, then after about a month I changed to the one with rubber sides. It wasn't a question of the noise-I wear ear plugs. I figured that the rubber sides might also help keep the chain aligned correctly. But have no idea if that's factual. Either way, very glad I did it, smoothes the V out at freeway speeds with no noticeable loss of power. Makes the speedo nuts on accurate.
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