Does anyone know of a custom car alarm installer that can provide the following customizations and/or provide me with an estimate.

1) Two way alarm.
2) Secondary battery installation /w Enough power to run the next item for up to 5 minutes.
3) Interior Siren Mount (110db+ preferred)

Update: Removed the voltage step-up requirement. There aren't any prefab kits for this so it's probably beyond reason. I think the rest of this should be reasonable.

 

You can get a second horn with a built in battery that will easily go 5+ I used to have one in another car that I mounted way up inside the dash and it would trigger with the main horn....____ed the dealer off when they disconnected the battery and the lack of power set off the horn the only way to disarm it was a key which they didn't have and they had to rip apart the dash to remove the horn! They said it was driving them nuts!

 

Sounds exactly like what I would like to do. My main goal isn't to make it louder on the outside. Just much louder on the inside to disorient / cause hearing damage for the people trying to steal from the vehicle.

 

Yep my idea exactly ...the other thing I wanted to add was strobes inside I figured then you wouldn't be able to see if it was at night! Just ask when you get the alarm done they will know all about the horn. I had one done at the shop on King / Alum Rock but it was so long ago I don't remember the cost, they did a good job though.

 

Custom Car Alarms in Concord off of Contra Costa Blvd. can take care of all of this for you. I've brought my car there and made my alarm purchase from them which was a two way system from Clifford Matrix. I highly reccomend you go in and talk with them, or give them a call.