6.7 head swap with 03 common rail
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possibly better airflow, bout the most i can guess... havent had a chance to look under the hood of the 6.7 really but from the aftermarket intake horns they're wider which to me means more flow to accomodate a better flowing head... so if anything that's where you'd see the increase from not b/c its a 6.7 head instead of the 5.9
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