I wound up installing a Pioneer system in my fifteen year old Lexus, mostly to get Android Auto integration (which was a bit of a letdown to be honest). It was a huge pain in the ass, as the Marc Levinson system that was already there doesn't play well with aftermarket. After manually wiring each speaker to the headunit (then replacing that wiring with higher gauge and quality) and installing a new subwoofer amp I wound up with a pretty good sounding system. It's not in competition with a brand new THX designed and factory built system, but was it worth the effort I put into it? Probably not.