Thank for the valuable information, to which i have a question regarding direct injection. From what i've heard there tends to be a loss of power with direct injection over time. The reason being is that due to emission requirements the use of the crankcase ventilation system seems to oil coat the the intake tract causing a loss of horsepower. This was based on an odservation of the Audi R8 losing about 1-5 Hp per 1,000 miles. Would this be a posible reason apart for the D-4s System?