It would be nice if we wrote SEMA on this, and petitioned our state government for a decibel law.
The original purpose of this law was to keep noise levels down, and the lawmakers in VA just happened to write a law that could be interpreted in the worst way, especially since the advent of the fart can.
Since I have moved back to VA, this stupid law has been at the fore-front of my mind. I know all of the legal loopholes, but I figured, "Why not just make the exhaust a whole lot inconspicous?"
Here are some ideas on what I think it takes to keep the cops off your back:
1) Use a smaller tip than the typical import exhaust.
2) Paint the entire exhaust up to the smaller tip BLACK.
3) Install a turbocharger (muffles the exhaust a LOT)

4) Get a muffler shop to make you a silencer that you can remove when you feel like risking cop attention, or when you run at the track/autox.
5) Remove big wings and crazy graphic schemes
6) Buy a car besides a Honda (this is in jest, but they target Hondas!)
Good luck. I doubt I will have much (luck) with my wastegate vented below the car and a 1200rpm cam lopey idle, even though I have taken all the measures above.