alarms dont do shit these days though. when people hear them go off its not like they get up to look out their window and say "hey someones breaking into that car over there" they just ignore them. so you gotta get something where you can like track your car down or make it so the car is unable to be driven away.
but if you really wanna do it up big you can make whoever is stealing your car go deaf or atleast get the whole town to look. but itll cost you like $2k. theres a site
www.hornblasters.com that carries horns off of trains and theres this one on there that can be heard up to like 2 or 3 miles away or something crazy like that. you can just get that and hook it up to your alarm and just stick the air compressor in your trunk or take out your backseat or something. but thats just if you wanna go
BIG:thumbs up