I like the fast system but I cant say its the best since it is the only system I have worked with. With some help we improved drivabilty and increased performance over my stock mefi4 system. The car ran 12.66 with the stock ecm and in a few hours at the track with the fast system I ran a traction limited 11.72 and picked up 8mph in the quarter. The engine sounds totally different much crisper. Best $ I have spent on the motor by far. I am experimenting with a big stuff3 on my race car and it seems a bit more user friendly so far.
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John
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