Hey
i made a simple Car Tuner for RageMP with NativeUI.
You can open the menu with "F8".
I have it on GitHub for you feel free to fork it:
https://github.com/SupperCraft5000/Basic-Car-Tuner
You can Tune not all Thins but the Basics.
U need this resources,all those files inside runtime folder copy in your game root directory ...bridge/runtime/
https://onedrive.live.com/?id=B164FB0A6A13FB17!4406&cid=B164FB0A6A13FB17