4. Adding a rollcage can definitely be beneficial to the car, but to really stiffen the unibody of a Mopar, some sort of frame connecting device is the way to go. The Unlawful Racing Chassis Stiffening Bars are a 100-percent bolt-in device that can be welded if you want the ultimate in chassis support. Unlawful’s bars are not simply frame connectors; while they do tie the rear frame to the front rails like traditional frame ties, they also incorporate a crossbar that ties the left and right side of the car together for added rigidity. A driveshaft safety loop is also part of the Unlawful bars.