[BiturboS4] exhaust size

[California Fields]

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What is the diameter of the stock exhaust pipe from the cat back? What is the
diameter on the aftermarket exhausts?  Also, does anyone know the diameter of
the stock downpipes?

I'm asking because, even if you upgrade the stock exhaust to a larger
diameter, won't the flow still be restricted because the downpipes are still
at the stock (smaller) diameter?

Thanks, Carter.

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