Viper 791xv, 2003 Mazda 6

be careful and open up your siren, unscrew the pc board from the magnet, you will see the six tones labeled numbers 1-6 on the board use something sharp and cut the tones you dont want remember #1 is tone one # tone 2 and so on. got questions just ask. dont forget that when you are pulling the magnet assembly out you have to give some slack on the wiring that comes out of the back. the positive and negative wires of the siren.

under the dash, but try not to block it, just as close to some place sound can get through,,,

as far as the 530 (windows),, i have put a couple in, i like them, it's hard on older ones sometimes to get them to go all the way, but i think it's a really nice option.. it really tricks people out when they see you using them

the only thing that sucks is if your output (third channel or whatever) has a delay on it,, like if you have to hold down the button for 3 seconds to get the output to go, then it makes it a pain to auto start your car or arm it, and leave the windows down, it works best when it's used with dei stuff i guess... but that's how most products are..

I have two 530Ts installed in my car.  If you need help, feel freet to PM me and I'll give you email address.  It is pretty straight forward though.  I wired both mine in the driver's kick panel and ran all the wires in and wired at the driver's door switch.  It's great because I have full auto up/down on the driver's door switches, but when my kids sit in the back and want to just lower their window a little bit, their switches on the back doors function normal (without full auto up/down on the windows).

Good luck!