CFM =/= airflow

An engine pumps cubic feet of air per minute (CFM), but what makes horsepower is the air mass within that volume. The more you compress air, the higher its density, assuming you've cooled the air properly. Dense air packs more oxygen in the same given volume. In other words, air density is king. The Banks Monster-Ram provides an 88.3% increase in mass airflow over stock, meaning more air density makes it into the cylinder even though the engine is still pumping the same CFM.

Monster-Ram for 2007.5-2012 RAM 6.7L
https://bnks.pw/3tZz7R1

Monster-Ram for 2013-2018 RAM 6.7L
https://bnks.pw/3I6QDb3

Monster-Ram for 2019+ RAM 6.7L
https://bnks.pw/3638odF
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