Pro Systems SV1 Series Carburetor is engineered for maximum power output in street, high end bracket racing, class racing and Nitrous applications and produces very high cfm ratings that were previously unattainable. The SV1 Series Carburetor is slightly more expensive than Pro Systems 4150 and 4500 series carburetors, but on the average, it produces about a 10 horsepower gain over custom built 4-bbl carburetors. The SV1 is designed with a single venturi with special port layouts, and a booster that receives the signal as soon as the blade begins to open, resulting in incredibly smooth and very nice drivability. This carburetor will keep cold nitrous plugs from fouling out, so they stay clean and ready to go. Overall, the Pro Systems SV1 carburetor provides very consistent performance regardless of the type of driving requirements.