I've just got a new Apex and have also noticed the loud exhaust resonance drone between about 4500-6000 RPM. Very annoying and a helmet doesn't seem to help. Surprised Yamaha hasn't fixed this.
Get a trail jamz system. I tried mine out on my sled the other day and it was awsome... Love it and didn't notice the drone.. (but I didn't really notice it before...)
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