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I'm suprised no one has posted this yet, but here goes
I can tell a difference in throttle responce, and the greatest difference is in the summer in stop and go traffic. Cut way down on the bogging due to heat soak. Also I have the fake air ducts cut out with the Coastal Metals airflow system. That also made a noticable difference, plus made it a lot louder. Great bang for the buck CAI.