instead of the standard chirp siren. get air train horns , small tank and small compressor and i bet the person who touches ur car is ganna shit them selfs, thats what i am ganna do just wire it to a relay and bam ur set . im still waiting to install my five batteries and 2 air tanks . air horns for the win u can hear ur car down a mile away and at night if they **** with ur car ull just jump out of bed its a croud please . ur neighbors will hate u so make sure alarm isnt sensitive just when they open doors or hood.