An increase in performance is immediately noticeable. I drag the trailer over the ridge line and it helped me get extra momentum in the hills. But in everyday driving I didn't notice any change in mileage. I would say that after removing the stock air system I would tighten it regardless of horsepower!
π§ Improved Performance: K&N Cold Air Intake Kit for 2007-2009 FORD Mustang GT (63-2565)
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π Enhance Your Vehicle's Performance with the Airaid 200-919 M.I.T. Modular Intake Tube.
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