Stealth.
In my last car (g35 coupe) I put the deck in the glove box (got a remote anyway)
Simpler to install and invisible. Use factory openings with original covers (no one wants stock speakers, so if they can't see them....
Keep the car in a garage if you can, big doors slow crime down.
Stay in your car in high risk areas and hide, when the perps show up shoot them, I suggest a .357 or 40 (auto) as a minimum.
Hire a car bodygaurd, I'm available for 120K a year, but I need holidays.
Use a scarecrow that looks like a cop.
Use bumper stickers like " don't break in , you might see your mothers ******"
OR " This car protected by AIDS"
OR " This system by Radio Shack"
OR " This system taken by your sister - she was a good lay"
OR "please don't take it, its all I have left after Obama"
OR "What would Hillary do"
OR " I'm deaf, please leave it cause I like the decor"
OR " please don't take, its all I have after the priest fondled me"
OR " I rubbed it with pork fat musslim boy"
OR "This was Ted Kennedy's before he drowned that *****"
OR "This is Bill Clinton's, beware of stains on the blue part"
OR " This is Kayne West's car, you will never here the end of the *****en"
OR " get a job, build your own loser"
OR " I couldn't have shot you, without you, go ahead"
OR " I love target Practice, keep going"
OR " been waiting for a moron like you, mama said you'd be here"
OR " Your about to have something broken off in your ass"
OR " better than you has tried"
OR " Hope your in a Union, they do bail outs"
OR " lost your job at McDonalds again?"
OR " Obama's checks aint coming fast enough?"
OR " This won't increase your food stamp supply"
OR (if your a redneck) " This won't work in your trailer" not on AC or DC, you need the European converter...........