To remove the CodeMasters logo on the racesuit you will need to create a blank psd, save as dds, and then upload into the logo file for the racesuits.
I can find the exact file if you need but it's in the same folder where you replace the racesuit.
This will remove all Codemasters logos including on the neck.
I don't see anything else unless you have questions.
The numbers would look better in my opinion as another color or even another font (These can be modded pretty easy just require a lot of ERP since each number is different.)