After some searching, it appears that Dodge and Chevy require the canbus decoders. That adds at least $20 to the price. It's simple to install them. They just fit inline in the wires. The connectors are already attached.
My Silverado shouldnt(2011). All vehicle dependent. Some Dodge trucks dont need them either. Majority of newer Jeeps seem to need it. Volvos. Probably a good idea to see what ya like, call the manufacturer and find out.
