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15. The items you see here are part of the natural leak vacuum detection (NLVD) system that was required as part of our 5.7L Hemi engine's emissions-control system. At first, we were worried that they would have to be modified and relocated farther from the gas tank, but as it turned out, a perfect spot presented itself just to the right of the rear winch mount. We didn't even have to change any hoses or wires for the system to work. A couple of holes and two 3/8-inch bolts were all we needed to solve this problem.