I do not know!! I know that from the factory (choke) the power of the bike, to pass some tests to enter production, ok but I put on my Z1000 08 full exhaust Akrapovic, filter, oil, spark plugs and brain PC3 And I got almost 9hp!!!!!!!!!!!!! and you got 20-25hp!!! probably the magical fuel !!!! the improvement of the engine which was the passage of time in Z.(Sorry for my English)
