Sheeze, isn't it obvious?
All this noise debate started because 3 or 5 cars where really loud.
How about some self governance?
Qualcomm isn't a big track, it's in a valley!
If your p-car is really loud, bolt on a muffler when you are driving it in a residential area.
There. No new rules, no enforcement, no discussion, problem solved.
...nevermind, missed that boat.