| " There's only so much benefit you can get from opening the exhaust manifolds since there's a turbocharger directly downstream of it with a housing that funnels the gases through a rather small annulus leading to the turbine " do you really believe that a smaller opening to the exhaust manifold is better than a larger one ( in relation to all the manifolds currently available today ). Seems counter intuitive given that all the gains Zs have made the past 7 years have been from increasing intake volume + exhaust volume. I would think as the turbine builds boost the additional air volume would be helpful. 2005 huh --- has it been that long ?
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