“Installed 4 Kenwood 6.5 inch speakers @ 100 watts rms on front and rear doors, and 2 Kenwood 6x9 @ 150 rms on rear deck of 2017 alitima w/Bose stereo. Do I need a LOC to keep factory stereo, and what's the cost to add LOC, sub and 5/6/8 channel amp?”