viper siren output

[THUNDERBIRD 10+ year member]

ok i need to install a siren on a viper 150esp alarm kuz who ever put it int he guys car never put the sirien in, so i need to know what wire and color the output is, and maybe the plug if u know. i know it is on the back of the alarm but there is a addon on the back of it that is 2 way taped to it so i cant see. i think he may have remote start on it too but we cant find the modual for it kuz he has the bank of dei relays that normally go with the 551t. o this is in a 2000 impala ls

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