Quote:
Originally Posted by TurboBRZ
This is only true if the turbo manifold runners and collector are smaller than the stock header, which they are not. The stock exhaust is 2" and I have a 2" outlet on the back wheel of my turbo. Plus my runners are slightly larger on the manifold.
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That's not even remotely true.
Even the stock header with cat flows much better than the hot side of the turbo. A turbo is by far the biggest exhaust restriction most enthusiasts will run.
If a turbo flowed as well as a section of straight pipe, it wouldn't be able to build boost since the air would just be bypassing the turbine instead of spinning it.