The Walbro F90000267 450LPH pump is the highest flowing intank fuel pump on the market, and is E85 compatible! It's good for approximately 600rwhp on E85 and about 900rwhp on standard gasoline. The Walbro 450LPH pump can flow anywhere from 0-100psi (the bypass valve is set higher than Walbro's previous fuel pumps, which were around 85psi). Final fuel pressure is determined by your fuel pressure regulator. Please note that this is an aftermarket fuel pump, and some modifications may be required to get it to fit. You can add a installation kit, which consist of: Short E85 compatible connection hose, fuel strainer, clamps and electrical connector.