While you can unlock these legitimately through the career, using a Save Editor allows you to apply these parts to any car instantly, without grinding through the Blacklist. Here is how to do it safely and effectively.

Junkman parts are high-performance upgrades that offer better stats than the standard "Unique" or "Pro" upgrades. They drastically improve Acceleration, Top Speed, and Handling.

Navigate to the or Cars menu within the editor interface.

The most famous tool for this is the (often found on modding sites like NFS-Planet or Nexus Mods).