I'm looking at fitting an active sub, the low profile Pioneer one, into my Zetec. However, why would you make a permanent change to the Ford loom (albeit hidden) when you could get an SOT (also known as a Parrot lead) from Autoleads like this: http://bit.ly/eAcIl0 Then you have converted the Ford loom to an ISO loom inline and you can make a custom ISO lead to take off just the outputs you need to run to the rear of the car (i.e. the rear speakers or RCAs and ignition power). All this without effecting the operation of the OEM head unit. That's what I'm going to do I think. Any reason why this is a bad idea? Is there enough room in the dash for this approach?