VP U4.4 Reg Leaded Racing Fuel as the best choice for virtually any powersports application if you’re not bound by fuel rules. We design it to offer the biggest gain vs. cost of any performance part you can buy. VP U4.4 Reg Racing Fuel makes more power than pump gas across a wider range of applications than its predecessors. We formulate it as a direct pour-in replacement for pump gas. However, it require modest jetting changes. For instance, +2 main jets or +2 pilot jets at most. Our fuel experts blend U4.4 Reg for stock and modified 2-stroke and 4-stroke applications due to its higher octane rating. Contains MTBE. If you are not bound by fuel rules, this leaded fuel is the best choice for virtually any powersports application, offering the biggest gain vs. cost of any performance part you can buy. The latest generation of our U4-based fuels, U4.4 makes more power than pump gas across a wider range of applications than its predecessors.