SALE 10% OFF! There's Only One Ace. Konrad Marine's Ace™ Propulsion System is raising the bar for durability in the high performance boating market. The Ace™ features thick-walled castings, brawny bearings and shafts, and precision-machined super alloy gears, all cooled by a continuous flow of oil for added durability and smoother operation. The package includes the Konrad Ace™ stern drive with high performance nose cone, integrated extension box and transom assembly, external steering kit, and high performance BAM 1350 transmission.