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DEF is a fluid used in the Selective Catalytic Reduction (SCR) system to reduce harmful nitrogen oxide (NOx) emissions from diesel engines. While it’s effective for emissions control, keeping up with DEF levels can be inconvenient for truck owners. Since many people desire to increase their engine power, there are delete kits particularly designed to get the work done. Luckily, this problem can be resolved with an EGR (Exhaust Gas Recirculation) Delete system of your truck by swapping in our Flo Pro cooler kit.