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Porting Stock Exhaust Manifolds


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Have any of you ported your stock exhaust manifolds? Or have any of you noticed any room for improvement on the stock units when you have removed them? I have done this on two other GM vehicles that the stock manifolds where terrible castings for power, but a little die grinding and ceramic and they shaped up nicely.

I know this is not really a bolt on, but so many topics on exhaust manifolds/headers in this section.



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