Head to to get a free AG1 welcome kit when you first subscribe! Cold Air Intakes Increase Power and ! — BUT... there's a massive downside manufacturers don't want you to know about. Before you drop $400, you need to see the independent test data. In this video, I break down the real science using SAE papers and independent testing—not marketing BS. You'll learn why that 96% efficient filter is actually 4,500% worse than stock, what causes the most engine wear, and whether an aftermarket intake is right for YOUR truck. I test an S&B intake on my Duramax with real acceleration runs to show you the actual gains (spoiler: smaller than you think at stock power). Plus, why changing your air filter too often might hurt your engine. Whether you're stock, mild tuning, or full send—this helps you make an informed decision. Great Automotive Engineering References: Physics for Gearheads: Bosch Automotive Handbook: Internal Combustion Engine Fundamentals: Video References: Independent Duramax Filter Testing: https: Gas Engine Cold Air Intake Testing: SAE 2001-01-0370 Discriminating Tests for Automotive Engine Air Filters SAE 2013-01-0311 Effect of Air Filter Condition on Diesel Vehicle Fuel Economy: Follow my Shenanigans in Real Time: Facebook: / freedomworxofficial Instagram: / freedomworx #diesel #coldairintake #mechanic 00:00 Introduction 00:51 Stop Changing Your Air Filter! 05:16 OEM vs Aftermarket 12:12 CAI Pros and Cons 16:23 Should YOU Buy a CAI?