I am strongly considering the V4M system - with the sound-deadening foam and replacement A-Pillar tweeters, but without the BT module and without the sub/bass knob installed in the upper panel. I received one installation quote so far from a reputable shop in Escondido, CA..... nearly $2,000!!! Good gravy, that sounds like robbery. If anyone has a recommendation for an installer in North County San Diego, post up please.