A:AnswerTechnically yes, but you would probably want to get a line out adapter to convert the speaker wire to rca(factory speaker wire to line out rca to amp to new speaker wire to rear speakers. It would be more secure wiring wise more safe by adding a few fuses and would clean up the signal.
A:AnswerDepends on Best Buy location. You can set up an appointment online. I got mine done in 5 days just make an appointment online and drop it off on that day. Takes a couple hours depending on vehicle.
A:AnswerMan they charged me 145 ish to install an amp comes to find out the installer quit i had to call for a week to finally get a answer its been since mid January since i bought my system and still no installer have to drive 2 hours away to get it installed at another location at my expense so not to happy with there service