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comparing Dee's, Ash's and Seb's cars with one other is apples, oranges and pears. Conjecture at best. To obtain truly valid data, you would need a dedicated test engine, and swap nothing but housings. The restriction in the IC's and piping alone could easily account for the difference in max attainable boost. What appears to be lower boost when measured at the manifold may be a totally different story at the compressor outlet due to pressure drop throughout the IC system. The maps are created assuming pressure at the outlet, so the pressure plots aren't entirely valid unless you take this into account
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