Thanks all for comments!
@mau92: as I said, that is a lot of modding. I created new events:
-F12 against One 77
-F12 against Aventador
- Diablo vs Countach
-Old vs New: Aventador vs Countach
-Ferrari race cars event (FXX, FXX Evo, 599XX Evo, 458 challenge, and the all time winner f2008!) in 3 rounds: Dubaï International, Monza GP and Laguna Seca
For the red F12, look at your 2 rcf files, the material to replace is not the good one ;)
@Rassva: thanks! Here is the blue backfire mod made by me: Blue backfire
Extract the archive, put the "blue backfire" folder in your MODS folder, activate by JSGME, and look at the crd example. Copy the 4 lines in capital letters and paste them in the crd of the car you want!
@MB: as you say, nogrip is the place to be! But a lot of things are made by me. I take bases on nogrip and I improve a lot!