Client Sided Car or Server Sided Car?

Hello, I have a raycasting chassis, The car is held up by thrusters and the wheels are positioned by raycast. I currently have some managed by local, and some managed by server, and I'm also using Network Ownership. This has been causing some problems for slower devices, causing the cars to flip around and spaz out. I have thought about converting most of the scripts to Module code, and having some scripts in the car, But I'm not really sure what I should do. Any tips?