These fuel pumps are designed for a return-style installation only. Do not attempt to run these pumps in a returnless application. These pumps are compatible with 100% Gasoline, 100% Ethanol or any blend of Gasoline and Ethanol (E10, E85, E98 for example). These pumps are NOT compatible with methanol. For street-driven applications, it can be beneficial to combine a smaller fuel pump along with one or two larger fuel pumps. This allows you to street drive on the smaller fuel pump which has a lower amp draw and does not generate as much heat. Once you get into boost, the larger pumps can be activated to support your high horsepower needs. The easiest way to do this is to use a Snow Performance Boost activated pressure switch (part # SNO-81014) and a Snow Performance Multi-Pump Relay Module (part # SNF-20003). Available pump configurations are shown below: 2 Pump Street able Configuration (one 450lph pump and one 470lph pump). This configuration is capable of supporting 1000+ rwhp on e85 and 1300+ on gasoline. -Current Selection 3 Pump Street able Configuration (One 450lph pump and Two 470lph pumps)- This configuration is capable of supporting 1500+ rwhp on e85 and up to 2000 rwhp on gasoline. This configuration draws 10-12% less current than the Race 3 pump version. 3 Pump Race Configuration (Three 470lph pumps). This configuration is capable of supporting 1600+ rwhp on e85 and up to 2100 rwhp on gasoline. This configuration is designed for max effort/flow.