S&S Cycle has updated their performance cylinders for late model (1999 and later) Harley-Davidson big twin engines. The update is largely cosmetic, but involves functional improvements as well. The cosmetic changes are aimed at making S&S cylinders more closely match the appearance of stock cylinders. The new S&S cylinders’ fins look more like the fins on die-cast stock cylinders. That’s a real plus when they are used with stock cylinder heads, since they more closely match the fins on the heads. Speaking of matching, S&S cylinders are powdercoated, either wrinkle black or silver as an exact match for the finish on stock engines.