A series of modifications were completed to improve the durability, usability and biofidelity of the THORNT (THOR) frontal crash dummy. There has been growing interest in the safety community to develop a frontal crash dummy that is more sensitive to new restraint systems and more kinematically biofidelic in crash conditions with lateral components, such as narrow-offset or small-overlap impacts. As the THOR had been developed with these goals in mind, it was determined that enhancements were needed to improve the response of the THOR dummy while taking advantage of newer biomechanical data to enhance the design. So called “mod kits” were designed to make changes to the head/neck, thorax, abdomen, and knee/femur/pelvis of the dummy. This paper describes the mod kits and the resulting improvements of the THOR dummy response. Specifically, head changes were focused on improving vibration response, while neck changes included improvements to assembly and disassembly as well as improved tension response. Thoracic changes included creating new clavicle load cells and improving the thoracic deflection instrumentation. Enhancements to the abdomen involved removing redundant upper abdomen instrumentation and improving the lower abdomen displacement instrumentation. The pelvis and pelvis skin were completely changed to improve geometry and fit as well as adding enhanced load cells to the anteriorsuperior iliac spines. Finally, the KTH (Knee-Thigh- Hip) complexes were completely rebuilt to accommodate more deflection and meet recently established biofidelic response corridors under vehicle impact conditions. This paper will describe the efforts that went into the creation of each of the mod kits completed for the THOR dummy. The rationale, process and results of the mod kits will be explained.