Virginia law states no bottles installed in the car when its on the street. No if's and's or but's. Theyre strict here in Northern VA outside DC.

Furthermore technically VA state law prohibits any modifications other than those made by the manufacturer or dealer to correct a manufacturer defect or resolve a problem. In other words anything that didnt come on the car at date of manufacture is illegal here. Its essentially up to how harda$$ the cop wants to be.