I have a Python 881XP (same as Viper 791XV) and am trying to figure out what accessories I should add to the alarm. This is what I am planning on getting, want to see if there is anything I have forgotten/should get.

- Revenger

 

The immobilizer is part of your car - built into the key iteslf.

The Revenger Siren with Battery (515R) is kind of redundant to the standard battery backup. The 515R essentially goes off if the battery is disconnected and keeps going off until the battery dies. The backup battery powers the alarm, siren, etc.. in case of the same.

My preference is the 515R - simpler, easier to install and does about the same thing.

 

Thanks for your reply on the siren. With the immobilizer/bypass unit, this is what I am referring to: http://www.drdetailshop.com/556U.htm

 

Yes, you only need to bypass the immobilizer if you get remote start.