I don't have my PC under the seat, but I have an AMP under passenger seat.Originally Posted by Arathranar
The AMP I have is Pioneer GM-X374 the size is H1.94" W10.44" D9.31".
The AMP is tight under the seat, especialy the height. So if you can find a case that is about 2" height or less, or if you make one, I think it will work.
Here is the photo of AMP.
Like you can see, the PC case can be much wide. Just not any higher.
BTW, what year is your outback sport?
I hope this helps, and good luck.