with the temp change the cam advance may be diff than when its warm . i have notice that the z is always louder for the first 30 seconds or so when you start it due to the advance when you first start it . since its gotten colder outside ive noticed mines not as loud for that first 20 or 30 seconds as it was when it was warm outside . also in the past i have notice that exhaust always dose get a little less loud when its broken in . not a lot but enough to notice . might be a combo of both of these things .
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