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Thus far we have not seen the ceiling of the factory fuel system, so at present I can't say exactly what power level will require a fuel system upgrade. The N54's direct injection fuel system seems to have a very high ceiling indeed. I don't believe a fuel system upgrade will be required until well past the 500 hp mark.
ESS Tuning is at present searching for a 1M owner who is interested in testing their new turbo upgrade. Anyone interested in sending their car to ESS for development can shoot me a PM, and I can make the necessary arrangements.
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