Mercury - Cowling Decal Set 4.6L V8 250 Horsepower Pro XS Series Marine Adhesive Finish 8M0214863. Overview. There's something unmistakable about a Mercury Pro XS engine when it's dressed right. The lines, the colors, the stance-it all feels purposeful. When the decals start to fade or peel, the power is still there, but the pride isn't quite the same. This 250 Horsepower Pro XS decal set brings that pride back. It restores the bold, confident look that matches the way this V8 sounds when it cli