I run mine on a street car, with street mufflers. My gear drive makes zero noise. If I don't tell you it's there, you won't know it.

I've had people call me a liar at a car show I went to. I was talking to a few guys about it when I parked and I mentioned it was a gear drive. They had me start it again. When they couldn't "hear" the gear drive they said I was a bullshitter and walked away.

And how do you prove what you have if the gear drive is under the cover? Pull it apart I guess.