I have a 2011 Limited with 23K. I have this metallic raddle noise that I only hear on the left side. Doesn't matter what gear, and the noise intensify's as you reach higher rpms before shifting into the next higher gear. It was there when I purchased the bike in Oct. 2010. It has gotten louder the past three weeks. Initally the HD service told me thats just normal harley engine noise. I have a feeling that it could be the rollers on the lifters or the tranny. I have lots of wrenching experience on cars, so not sure if my hunch is correct. Does anyone have any feed back?