Mounted up to 6 in. closer to cab than other models, 160 DGE Behind-the-Cab CNG Fuel System offers optimized aerodynamics and additional rail space. System is made of aircraft-grade aluminum mounted on rubber isolators to minimize stress on components. Neck-mounted, anti-tank spin design eliminates tank rotation that can stress fuel lines, while Geomet™ coated fasteners offer maximum corrosion protection.