4K HD Wallpaper: Porsche 918 Spyder
Tobias Van Der Elst is the photographer that took this automotive photography. From his courtesy, he shared the Porsche 918 image on his Flickr account under CC By-Sa license and here's optimized for apply in your desktop backgrounds and homescreen phones.
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with many tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many phones)