GM E41 ECM Upgrade Kit non dod helps increase the volume of

helps increase the volume of airflow to your engine

E40 Bench Programming Harness

K&N 99-0621 Air Filter Cleaner will loosen and remove built up dirt and grime from your K&N oiled cotton air filter so it can be washed clean with water

no hoses or clamps supplied as catch-can mounting and routing can vary between application**

the panels fit snugly into existing or new OTR housings

GM E41 ECM Upgrade Kit non dod helps increase the volume ofUpgrade Your E41 ECM Right in the Garage Shop The new E41 ECM Upgrade Kit gives DIY enthusiasts and professional tuners a convenient option to perform the ECM upgrade on their 2017+ Chevy Silverado GMC Sierra 6. 6L Duramax in their own garage shop. The best part? Theres no need to remove the ECM from the truck. This means theres no risk of breaking tabs during the removal or reinstallation process. This kit also doesnt require any reprogramming or