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I’d like to know too. One would think it would be worse than oem because it deletes all of those factory airflow resonators that keep the flow rate as high as possible. But some people have reported an increase in throttle response with units like the HKS, and even OFT has recommended the snorkel mod where you heat up a pre-cut OEM duct and stick the bottom 2 liter coke bottle into the opening so the opening becomes more like a circle.
Just so damn expensive for the Japanese name brands!
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