We ran the WFO set up on the dyno on an SD engine last fall and compared it to the stock set up. The stock set up made more power and torque. I personally feel that the flat panel filter does not allow the same amount of airflow as the stock round filter. I don't have the sheets here in front of me but as I recall it was around 5-6 hp.
Just my $.02
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Bob Woodard
Brighton, MI
2012 SRT8 Charger - 12.70 @ 111mph
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