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I totally agree with you. I just installed GD super split dps and specialtyz high flow cats and my car is pulling hard at 12 psi than it did at 17 psi before. The key behind high flow cats is larger midpipes. Even if you gut the stock cats, you've got a flow restriction because of the 1.9" ID. High flow cats for our cars will have 2.5" ID midpipes which is 60% more cross section.
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