What product do you recommend for large (4'x8' or larger) wall art in a garage or mancave?
Gicleé print dry mounted on foamcore as a standout. Such is relatively light which greatly simplifies hanging, and is relatively inexpensive.
Inkjet printers that can make high quality prints generally have at least 12 ink colors.
Because it take a while to make a 8' x 4 foot print labs that can print that large have limited through-put for what is a very expensive printer and as such charge a pretty penny for each print.
The image you posted has insufficient image resolution to print large, and it has a 3:2 aspect ratio while 8' x 4' is a 2:1 aspect ratio.
You would want a photo that has image resolution of about 17,280 pixels on the long side for an 8' print..
The photo would have to be cropped to print as a 2:1 print such that the long side is 2x longer than the short side.
I would show you the photo you posted cropped to 2:1 but can't if you are not the copyright owner of the photo (can't read the logo bottom right).
TPF rules require use to link to photos that aren't ours rather than post them here in the forums.