I recently purchased the AutoSound radio. It installed in the original opening without issue and looks like the original. I used a two Kicker 6" speakers mounted in the kickpanels recessed into the air vent openings, one under each seat and a 12" Kicker Sub behind the seat. I used two Kicker amps and the sound is nothing short of awesome!
I don't know about warranty as I have only had the unit for about a month or so but so far I am very pleased.
Cheers!
Mickm