Grimmspeed battery tie down metal brace. I installed Radium's dual catch can setup and this wouldn't work with it, thus me selling it. Nothing wrong with it, just don't need it anymore.
$50
Link to manufacturers site in which it costs $58 before shipping. You'll save over $15 if you buy mine vs retail.
http://www.grimmspeed.com/battery-tie-down-subaru/