You guys all kill me. This is NOT a NA ride. Increasing air flow to the turbos is a fruitless effort as the amount of air that passes through the turbine is restricted by diameter of the inlet on the turbine housing. It's THAT simple. That diameter is smaller than the diameter of the pipes feeding the turbo. Making those pipes any larger simply isn't going to help. If you are able to stuff in a larger turbo with a larger diameter turbine, then yes you can benefit from a slightly larger air feed, but you will still always limited by the restriction point at the inlet of the turbo.

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