All credit goes to p4elkin for the model, I just added some parts and texture.
p4elkin's Mercedes-Benz C63 AMG mod link: https://www.gta5-mods.com/vehicles/mercedes-bens-c63-amg
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Things I did:
1. Added the rear spoiler
2. Added little scoops on the side of the front bumper
3. Added yellow tire branding
4. I changed the vehicles.meta to have a more accurate engine sound.
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This is my first Car mod I did, edited with zModeler3. So don't expect any update's for bugs, because I probably don't know how to fix them.

Installation instructions are in the ReadMe

sorry if my English is a bit off, i'ts because i'am Dutch.