Owners shooting for over 550whp on E85 will need more fuel than our ATS 1200cc inejctors can provide. For them we recomend (and use) the ID2000 injectors. I have personally used these at 828whp on my own MR2..and I can still daily drive it. It starts and idles in 30 degree weather and 110 degree weather. No other injector comes close to this level of consistency and performance. These are top feed injectors and require the use of our top feed rail and install kit.