Mercury - 300hp Rear Decal V8 Pro XS Series Standard Marine Finish 8M0217491. Overview. There's a small moment right before you throttle up when you glance back at your engine and feel that blend of pride and trust. A clean, sharp decal has a way of bringing that feeling to life. The Mercury 300hp Rear Decal 8M0217491 isn't just a label; it's a mark of what your V8 Pro XS is built to do. When you're pushing across open water before sunrise or easing back into the marina after a long run, it's re