Capacitors and other electronics?

1) Hi Ive heard that some fly cars have a capacitor in their lighting set up, it seems like a good idea to me, does anyone know the specifics on this capacitor or upload a macro picture of it. I would like to try wiring a capacitor into one of my lighting setups.

2) Has anybody wired sound into their cars? If so do tell...

3) Feel free anybody to please chime in with electronic ideas for cars.