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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.
Would be interested in hearing more here, have you done custom intake work that revealed this? I have not so I can't disprove, but on the surface it would seem easy to make a turbine sizing choice that would completely override any tuning in the intake (i.e. stick a bigger turbine side on this theoretical engine we are using and the manifold may still produce a low rpm TQ bulge the bigger turbo is going to cause a mountain of TQ above that range)
70 Sport Fury
68 Charger
69 Coronet
72 RR
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