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Every intake dyno I've seen that makes power also had leaner AFR's.
I would guess these do nothing after a tune over a stock car tuned for the same afr's.
The only benefit i could see would be after a full exhaust and headers when the car may need that little added airflow.
I bought a panel filter so i could clean it and sounds a bit better. (very dusty in the desert)
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GR86 MT premium
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