best best 2nd gen swap kit 6.7 cummins

5 Best 6.7 Cummins 2nd Gen Swap Kits [2025 Guide] Is your 6.7 Cummins feeling a little… restricted? Like it’s got a bad case of the Monday blues, even on a Saturday? Maybe you’re experiencing that dreaded turbo lag, or the factory setup just isn’t breathing the way you know it should. We get it….