Over the fender well across under the trunk floor where the TCU and
or other optional electronics modules are stored Back over the other Fender
Well to the battery. If you want a picture look in here .
http://www.e90post.com/forums/attach...3&d=1329017429
There are plenty of pictures in other install threads also .
http://www.e90post.com/forums/showthread.php?t=641323
You don't ever want to do cutting .
I have read plenty of intstall threads and only those that
are fabbing entire sections ever do that and rarely do that.
What are you putting it in?
Since I am assuming you are putting in an amp that fits in the
stock location.
http://www.e90post.com/forums/showthread.php?t=324214
I think he does break out some ribs for this.