Assetto Corsa noob here, what do I modify in the aero.ini do increase downforce?

[furryboy96]

Hi, just got the game and for fun and curiosity, I want to modify a bunch of GT3 and GT2 cars to make them as fast as prototype and Group C cars. I will give them all the same powerful engine but I know that I need to increase the downforce so that they can keep up with prototype/Group C cars in the turns. However there is so much **** in the aero.ini that I don't know where to start.