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Do you want a Litre bike or do you want a custom bike??
I doubt you will be able to mod the F4i to the same speed as the litre without a Turbo or Nitrous. So the answer is all yours.
Yeah I was looking for more horsepower more speed so there isn't any way to get the f4i to the same level as the zx10r unless it's going to be a major modification.