Whale Tail XLAluminum Stabilizer and Ski Boat FinImproves performance in any I/O or outboard motor!The Whale Tail XL extends out behind the prop to utilize prop wash energy which is normally lost. Whale Tail transforms this energy into lift for immediate response when the throttle is applied.Unique hydrodynamic designStabilizes bow-light boatsPops skiers up in less timeFlattens wake for water skiing; creates positive, skid-free turns:With bow lowered, visibility and safety is improvedSmooths out ride in rough waterReduces porpoising & cavitatingIncreases top speed and fuel savings in most applicationsMounts on the anti-cavitation plate of all inboard/outboards and outboardsInstalls in 15 minutes with stainless steel hardware includedMarine grade aluminum with durable anodized finishUse the Whale Tail XL year-round in freshwater or saltwater to improve performance of any boat!