Howdy,
They are vent hoses that route to the top of the air box and stay wide open. This allows fuel to displace the area that air used to occupy. I removed mine and turned the nipples at the carbs down. There was a discussion on the best thing to do here in the past on the Bandit list. Leaving them there is just fine.
Lights are triggered from the metal on the car. There is a wire in the ground that senses ferrous materials. Your bike doesn't have enough to trigger it - just another way that the DOT ignores bikes. Put it in neutral when you stop and put your kickstand down directly on the tar strip that covers the wire. Works every time. Don't get out of gear until you're sure the louse coming up behind you sees you!
As for radar, a bike has a large crossection so there's plenty of opportunity for a radar burst to reflect back to the gun. Other than to buy a Corvette, there's not much you can do to reduce the radar section.
That's my opinion - sticking to it.
Marc/Atlanta
'99 Bandit