Not sure about this one. I can only chime in on what I've been told from various people, so take it with a grain of salt:
- Exhaust cannot be modified
- Exhaust cannot exceed a certain decibel level
- Non-factory HIDs illegal
hose I'm sure about:
- Not supposed to mess with the cats
- Tint not to be darker than 35%
- Stereo cannot exceed a certain decibel level
- License plate covers (front or rear, clear incl.) illegal
- Headlight/taillight covers of any kind are illegal
- Lights other than OEM colors are illegal
As far as passing through another state - I've seen plenty of out of state cars in my area (esp. Florida - reside in my area) with limo tint. I'm assuming since I see them all the time, it's not a problem.
But like you said, tons of ricers and I've never seen them get harassed so....