Depends on the fuel used, and how much power you make. Boils down to BSFC or Brake-specific fuel consumption.
Some of the turbo methanol powered cars are running dual and triple sets of 160's for each cylinder!! Some of the big block twin turbo cars that make 3000hp require two sets even for gasoline.
I'll be using one set of injectors for mine. It's just a streetcar.
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