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It just smooths the entry to the maf. The POP charger isn't the only filter adpater to use a velocity stack either- if you search someone found a cheap adapter that uses one. HKS uses something similar on some of their adapters (Z32, but not B13 IIRC), as does Blitz.
Versus a cheap e-bay adapter (essentially just a plate and a pipe) the POP showed a 1HP gain pretty much all through the powerband (this is from personal testing, not regurgitated magazine numbers or whatever).
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