In the car editor window, look for a section labeled . You will see checkboxes or dropdowns labeled:
When installed, Junkman parts push the stat bars beyond the maximum limit of standard Ultimate parts. A car fully decked out in Junkman parts is faster, grips the road harder, and withstands more damage than any other vehicle in the game. For speedrunners and casual players alike, having a "Full Junkman" car is the pinnacle of performance. Nfsmw Save Editor Junkman