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My M5 only equipped with an akrapovic line only rolls with E85. The reprogrammer had difficulties in the development. The performance gain is almost impossible because the HP pumps are reaching saturation. At the passage of the summer E85 (I do not know if it's like that at home but in France the ethanol rate varies between summer and winter) he had to resume because after a few accelerations the car was safe following a pressure drop of 2 pumps. I even replaced the low pressure pump for safety, but that did not change anything. Since his last intervention I have no more cuts. It's 20,000km that I ride only at E85.
So it is possible but no gain possible because we are at the limit of the capacity of high pressure pumps.
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