This is the silent hero. GTA V has a limit on how many dlc.rpf packfiles it can read. When you install 300 cars, you likely have 50+ DLC packs. The Packfile Limit Adjuster removes that cap entirely.
When you add a modded car, you aren't just adding a 3D model. You are adding: gta-5-gameconfig-300-cars
The stock GTA 5 gameconfig limits how many "pools" of memory can be allocated for vehicles, pedestrians, and map objects. A custom version: This is the silent hero
Most 300-car configs come packaged with the heapadjuster.asi and packfilelimitadjuster.asi . These go into your root GTA V directory (where GTA5.exe lives). The Packfile Limit Adjuster removes that cap entirely
With this guide, you should be able to run 300 custom cars smoothly. Start with 50–100, test stability, then gradually add more. Enjoy your expanded GTA V garage!
You have the capacity. Now fill the garage. These car packs are optimized to run beautifully with the 300-car gameconfig.