It’s a tricky area because DEF systems are tied directly to emissions compliance, but some owners explore options to regain lost performance while keeping the engine safe. For instance, there are specialized solutions where you can build a custom DEF delete kit that ensures the system is properly bypassed while avoiding engine faults. One such option is the cummins def delete kit, which is designed to maintain engine health and simplify long-distance driving. The key is to follow professional guidance and avoid shortcuts that could stress your engine or fuel system.