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If your 305 is trottle body which i assume it is. Off of the air box that holds the air filter there is supposed to be a rounded off square looking box that connects to the part where the air comes into the intake. If that piece is missing it will tend to make a whistling noise while it is taking in air. Cause i have a 305 in mine for now and it doesn't make it but i have that silencer box on mine. So maybe that helps if not i at a loss cause i don't think mine makes it.
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