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one of the other considerations is that turbulence can move upstream of the actual thing causing the turbulence (think bow wave in front of a boat) so what is downstream of the maf can affect its reading.
one can assume that a bending accordion tube creates considerable turbulence, and first instinct is to smooth the flow. apparently porsche calibrates the maf readings to take into consideration this turbulence, however, so best to simulate oem as much as possible.
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