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Originally Posted by BAN SUVS
How does it create more backpressure by being closer to the turbo? Shouldn't the pressure drop be the same across the cat regardless of where it is? Or does the extra volume and additional exhaust cooling before it gets to the midpipe make some weird thermodynamic change that I don't know about?
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Both... Pressure is a function of volume and temperature!
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A quick example would be to compare how long an engine will continue to idle with a blocking plate after the turbo vs. after the stock muffler. Neither will be long, but the differential will be relatively huge.