Check out this build by Xanth. Half way down you can see the wire runs for the ECM and where he has things mounted. He is the best candidate to ask about space.http://www.fiero.nl/forum/Forum1/HTML/069143.html
Also this is from member Bradester..
Here is my setup. Im happy with it and I didnt lose too much leg room at all. Its a Pioneer 10" and only needs about 3" for the box.
[This message has been edited by IMSA GT (edited 05-24-2008).]