NO its not illegal to put a system in your car. its illegal to go over a certain decibel rating outside your vehicle. which i do not. i actually have a dB meter IN MY DASH. i didnt tint my window to protect my system. thats waht my alarm is for. i tinted my windows to keep the sun out of my fucking eyes and to protect my interior from the harmful UV rays. i dont bump my shit in neighborhoods at night. and i listen to mostly rock and classical music when my windws are down. gangsta shit is for when the windows are up and nobody can laff at the skinny white boy with Beatz