Cyber March

Look at that video, this guy is using 1 single truck air horn and he is operating it with 2 direct driven electric compressors(the mini ones that you get in the horn kits from hella....those small barell type ones you get at the auto parts store) He siad it is working. And he uses 2...but will this really work good and do you see any disadvantages to it.
Im puttin it on my car. I want to get one grover air horn and use 2 of those lil compressors that he bought.
A real on board air system cost jsut tooo much..

Any suggestions , ideas or criticizms you can give on this project idea?
WIll it work?

thanks