cdv removal

Hi, I recently bought a 1998 1.9 z3. Cassette radio was disconnected, and its obvious that the previous owner tried to replace it with no success. There was a broken CD changer at the back with all PCBs broken. I am trying to install a new stereo, i bought the cable that converts the BMW...

Anyone done this mod? Any info appreciated. Car can be a little jerky when taking off if you don't take your time, and takes a while to really bite on the clutch during rapid gear changes just for a spit second, Are these all CDV related issues?