Ok, gotta look into those.
I just read the above topic and started thinking. Is it better to use a seperate harness or tap the signal as mentioned above? If using the latter, could I use all "normal" A/B amps, as long as they have a high-level (speaker) input? This would make the job a lot easier.
Edit: the size or the fitment of the amp doesn't have to be oem-look...