I already have the 550ESP but it has been acting up lately. I've been thinking about replacing it to a better system, which is the 591XV/2-way. I've been looking around where I can buy them with descent price, and I ran into http://www.drdetailshop.com, I was wondering if anyone ever dealt with them before. Do you have other places that you can recommend?
thanks,
BloodStorm

 

i'd go to an authorized DEI dealer, because all dei alarms (including your viper 550esp) have lifetime replacement warranties... they will swap it out for free, or possibly give you store credit for a new alarm!