So Ive been working on a co-workers mkIII just doing random stuff Tune up, timing belt, hitch install, etc. Everythings been great other than the stereo. It has been the bane of my existence. After getting through the immobilizer issues, now I'm not able to get the speakers in the the rear door to make any decent noise. Even cranked up they kind of just hum along at a real low level. Is this because the aftermarkets are twice the resistance of the factory speakers? If so, is there a solution? The car originally had the "premium anti theft audio" deck in it, and it has the four wire harness for the rear speakers. Now it has a Sony HU, and pioneer premier speakers running the only two wires that would make any sound.