Owners shooting for over 550whp on E85 will need more fuel than our ATS 1200cc inejctors can provide. For them we recomend the ID1700X injectors. Injector Dynamics X series are the most accurate and consistent injectors available. Fully compatible with gasoline and all percentages of Ethanol. No other injector comes close to this level of consistency and performance. These are top feed injectors and Gen2/3 motors require the use of our top feed rail and install kit.