Car Advertising

So the deal is that I'm both trying to make some money and I'm trying to get an audio system in my car, e.g. Subwoofers, amps, tweeters, speakers, etc.

Basically my sort of idea is advertising a company/website, whatever on my car with something like magnets or whatever we can work out to do. I'm not sure if this is something that would even interest anybody but it is definitely an option for me as I have my own car and drive around daily to schools, gyms, stores, and other places/events.

Anyways, maybe if you're interested then we can work out a deal.. or if you're an audio company I can bump your system and advertise your product all around.

Thanks for taking the time to read this.
I realize this is kind of an out-of-the-box idea but it's worth a shot.

Regards,
Dylan