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When it comes to exhaust on a turbo car, bigger is better (to a point). The turbo is always going to be a restriction in the exhaust system, so getting exhaust through the turbo as fast as possible is the goal.
On an N/A car the exhaust can make a big difference because the change in exhaust velocity. A smaller exhaust is going to have a higher velocity speed than a larger one, which will help with low end power/torque, but suffer up top, and vice versa. Same thing with an intake manifold, like an carburetor intake manifold for a V8. A small runner dual plane manifold will provide better low end power, where a single plane large runner high rise manifold will provide better top end power. Of course, this stuff really doesn't pertain to a turbo application. Bigger is better.
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