I just bought an 03 audi a4 upgraded my system. I put in a alpine dvd double din and jla audio amps and subs. Now i am scared someone may steal everything. I am just wondering if the ffactoru alarm will be sufficient or should i upgrade to a viper alarm. But i heard about the electrical problems that audi's have. So i just need input from other members who have upgraded their alarms and if any problems occurred after the installment. Thank You.