My wife has a '15 MB C Class with the standard stereo & I was wondering if I needed to add an OEM integration piece to run aftermarket speakers & amps. I have a '14 CLS550 with the HK system that I plan on doing the same thing to. Does anyone know or have suggestions on this? I'm pretty sure the CLS needs OEM integration due to the fiber optic wire that comes with the HK system. Help please. I wanna do this for my wife's car pretty quick. Thanks