I don't have any proof (aka dyno), but in theory, any additional airflow gained from reduced backpressure would still be metered by the stock MAF sensor, and fuel would be adjusted accordingly.
Intakes on the other hand, tend to alter the airflow at the MAF sensor itself, causing either a lean or rich condition unless it is carefully designed to replicate the flow of the stock intake system at this section. A custom tune should be able to make up for this if done well.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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