I am looking to install a 12in sundown sub in my trunk but I want it to the right side in the corner to maximize my trunk space. I’m having a hard time locating one can anyone help out please?

 

Boxes like these are usually custom. The best thing you can do is to have an average measurement of what would fit and shop for boxes that fit that, outside of this would be to build your own.
Its possible to use the top of the trunk (where the stock sub goes) and bolt a sub this way. An enclosure in this location would be a more squared one than the corners.

 

+1,

I have two 10" subs in my trunk, one on each side. They conform to the interior contours of the trunk to maximize the space inside the sub while giving me maximum space left in the trunk. Given the size requirements of the subs (.85 cu ft each) there still isn't much room left over but much more so than building a box out of wood. The subs are fiberglass (about 15 layers). It was my first fiberglass experience and would highly recommend it for anyone wanting a custom mount. Getting a 12" into the trunk of a G will either require laying the sub down a bit or firing the sub up and the trunk lid. There's tons of information on the process on the internet. I threw in some pics to illustrate the process a bit and you can see even 10's were tight given the shallow depth of the trunk in the G


Cleaning release agent, tape and tinfoil off the fiberglass form



Mating speaker ring with the fiberglass body


Bracing the speaker ring prior to wrapping with cotton cloth



Completed pair covered in trunk liner fabric