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I think 'negate' is a very poor word here. The more appropriate word IMO is 'override'. The turbos will override any ram effect with their greater ability to create increased pressure.




Based on what I know from turbocharging 2.2 and 2.5 engines I can assure you even at high boost pressures the runner tuning still impacts the engines operating range.

If anything it tends to magnify the effect.