New brands of engines.

[Barlo]

Yes, I think so, you should create an air-cooled engine ICA. Would give a more classic look as well. Like the filter that you have made could be used safely with KF3 or KF1 

[DéDé]

I think Aixro could be a good choice for new type of engines, too.

[johnpike]

I think you should fill the classes already available with the various types of engines present in these classes, like for KF1 Vortex Maxter Maranello IAME TM XTR etc. and then for KF3 and KZ1 as well.
Also I don't understand why the classes are called KC1 and KS1 because there should be no naming issues or copyright infringement since it's just a kart class?

[Stark]

I think you should fill the classes already available with the various types of engines present in these classes, like for KF1 Vortex Maxter Maranello IAME TM XTR etc. and then for KF3 and KZ1 as well.
Also I don't understand why the classes are called KC1 and KS1 because there should be no naming issues or copyright infringement since it's just a kart class?

You mean visual difference between different brands of engines? 

[EVO]

I would make engine models like i make dash models for the community

[DPKarter#43]

What about if we make all the different types of airboxes and then we can choose in game, which one we want