I've been looking through the forum and searching online and haven't found any answers for this, is it possible to retrofit the higher quality premium system into a 10 speaker Hi-Fi M? My previous car had the premium system and it was notably better sounding than the current one I have. Would it be more worth it for me to get some of the speakers someone mentioned were made specifically for the impedance of the one that I have? Would that still be underwhelming compared to the stock premium sound?