You can turn the existing wheels into pressureWheels. They'll look the same but will also work much better.
Turbos, Yes please. It would be amazing to have some rotaries in game. Then i could finally make some Turbo rotary Drag cars.
Maybe you could do a supercharger. There are people out there who run crazy amounts of horse with a supercharged rotary.
This is looking absolutely awesome, I love the attention to detail you are putting into it. Please keep up the amazing work. If you need any help with the jbeaming or suspension feel free to hit me up, I have been spending quite a bit of time lately experimenting with the latest release and have had pretty good results with most things.