newer alarm would be best choice. If you have a "responder ready" Viper like the 350 HV, or the 650 HV, DEI has a two way upgrade kit. I have a four year old Viper 350 on my work car. I added the two way remote upgrade kit so i could know when it was going off, and what trigger it was. it will tell me sensor, door, or hatch. Thats enough to keep me happy...for now.