i did make a video on how to use the erp archiver here - https://www.youtube.com/watch?v=xVAczc-Dcew&t=1s. one thing to note is the merc performance file is in the common file for this year's game. all of the 1kg cars are under the 1kg folder.
Why would you release a mod that 'breaks' the game as you say in your video. This mod just makes the car bounce around and makes the game unplayable. Simply no point in this mod.