This is my vote. Put a newer siren on the top of it to go along with the sirens of today. Really flashy and bright.
Get pulled over for speeding = reduction in points.
New sounds & engine noises.
Maybe somehow work a way where you can crash?
A ramp where you can jump over something if you hit it correctly. Or maybe you can set up the ramp/jump by hitting a specific combo, and then if you do the ramp you can jump over or through a ring of fire or a canyon or whatever.
So many possibilities!