What do you mean drove you crazy?
Japanese units are very boom fizz, is that the sound you were seeking?
Can you post a picture of the single headunit adaptor in a Golf Mk5.

Does the other features like speed senisitive volume still work?


Crazy = irritating because it sounded wrong and spoilt the enjoyment of the
music, even voices sounded 'boomy'. My current Pioneer sounds great. Sorry
no pics and I haven't got anywhere to post them currently, you'll probably
find some on the mkiv forums or vwvortex. Basically the single din unit
goes in either the upper or lower slot and the unused slot can have another
audio unit, a blanking plate (doesn't look so good imo), or a 'cubby hole'.
GALA doesn't work on my system, that's not to say it won't work on others,
but I consider that a small price to pay for decent sound.