The sound isn't overly loud. If the hood is down you can't really hear it unless you are really trying to. If I hit the throttle cable the sound can not be heard (but may be due to the engine noise). Car runs great. Doesn't smoke or burn oil.
REV: The gas can also be smelled at speed. My fiancee was driving behind me and could smell it at highway speeds.
Thanks...
Slade
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