I had the wire for the truck release disconnected and the actual key cylinder on the outside of the trunk was taken out and filled in. I bolted the sub box down so it could not be moved from the back seat making the only way into my trunk, the keyless entry (and I had two just in case).

Best thing to do to prevent a thief is to not let them know you have a stereo in the first place. Do not play your music in your neighborhood (mad neighbors are prime suspects .. LOL)

Any visual deterrent is better then nothing. If a thief second guesses himself .. he may think twice about it.

Park your car in a well-lit area. Motion detection lights are the best. Thief’s like the cover of night.

Park as close to the house as possible. Thief’s do not like the fact that someone can sneak up on them. they are the ones trying to do the sneaking.

Make your stereo heavy and awkward to carry .. I put weights in his sub box just to piss off anyone trying to steal it. I also put no edge on the box so you can't pick it up especially with the extra weight!

Take out the factory screws and miss-match the screw types around your subs and bolt it to the car. That way if they want it .. they have to piss around with a few types of screws to get your subs out .... piss around with bolt that holds the box down and then steal it... trust me, they don’t usually want to be around that long.

I put a personal alarm in the trunk. You know the ones that you use when you go walking at night? When the pin is pulled it squeals away and it's loud! This is mostly a paranoid thing .. so if they have a way around your car alarm .. they will never see it coming but they will surely hear it and hopefully so will you with enough time to chase them away with a shotgun in your hand

Anyways, this is my two cents. Take it for what it's worth.

some good tips, and some bad....

As for the bad... the idiots should not be in your trunk in the first place ... A screwdriver in the subs is better then replacing the box and the subs... although you shouldnt have to replace anything because people should just leave your sh*t alone .... a tip is just that .. another persons ideas set forth for others to use. And who knows, with them having to screw around extra long .. maybe you might get lucky and have a cop drive by or some big motha f'er who doesnt like the idea of someone stealing someone elses crap and that theif gets what is coming to him rightfully. *WINK WINK*

You can also get a type of car (old man car's) that typically no one thinks there is a stereo in. Like chevy capri classics, mercury grand marquis, buick roadmasters, ford crown vics, ....
Basically, the exact opposite of a tuner car.
And don't put those huge ridiculous stickers on your windshield, advertising you have something worth some cash in your ride.

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My Babies:
04 Triumph Daytona 955i
01 Yamaha SRX 700
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don't post on sites like these with a list of what you own, or what its worth....

I love it!!! The weights and personal alarms!!

I would way rather have to do a claim or recone on a couple subs and know that the guy wasted his time and doesn't have my gear!

I used to have a few piezo sirens in my old car all over the place - that way if they did want to break in it would be mighty uncomfortable for them.

I say put a couple nice big handles on the sides of the box - "forget" to take off the razor blades under them - that you put there for triming wire during the install ... then bolt the box to the frame! That should hurt - you'll need a good detailing in the am though!!

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Tony Dehnke - Salesus Reptilius for some 12v stuff

connect a secondary alarm to the amplifier remote turn-on(a few switches will work too), and a signal generator.
trigger a burp if someone gets into your ride....lol

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Atomic + E Audio = Loud
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old man cars one idea
this guys pretty much has it right
you can also put a camera on your driveway and actually catch them. that might work too

maybe this is off topic, but can you legally beat the shit out of some one with a bat that is breaking into your car ? or blow a hole in them with a deer slug ?

just curious , not that it would stop me . just curious .

you could, n than u'd get sued. go to jail, n make friends with bubba. criminals have more rights than we do. cut the ****er into peices n scatter his/her, boody parts all over canada