One thing that will help reduce noise is a shrouded air filter. Kyosho cars used to come with them but nobody used them. They are required in europe from what I have read and reduce noise pretty well. Not so popular here because the reduce performance slightly.
"I have no idea what you're talking about, so here's a bunny with a pancake on it's head."
In mind and body, we're all heading towards old age. It is slower to go by bike.