im still using unity. as there are only me working on the project, i wouldn't say that 'some wants to use irrlicht'. and besides, i think unity is the best way to go for indie development, as its asset store is really big and full of very useful things, like vehicle physics. i couldn't find any good vehicle physics scripts in unreal or crytek so far. there is beamng for example, but that would also cost money for sure. so i will stick with unity for sure.
also, thanks for the compliments! the models are from our forum member FLED, but he seems to have disappeared, i will try and get back to him soon. in the demo, though i'm planning to use only one car.