Went to a local installer to get the VIPER 3105V alarm/kill switch/remote start system installed. His price is WAY higher than Best Buy, and he said there is an extra module or devise required for my 20203 F150 XLT. Anybody know what the extra thing is?

 

Its probably a DB3 module or something like that.
https://www.crutchfield.com/S-MNVF8D...ce-Module.html