Annoying sounds from cars at stop light

The only thing my son has shown a "real" interest in is what "it" does, and resale value. The Conversation is always the same.

He pays a visit when I am listening.

Son - Hey Dad, what is this, and what's it for ?

Dad - Son, that is a XXXX, and it does XXXX. 

Son - so what is it worth dad ?

Dad - Son, it is worth XXXX on the market.
.
.
.
Dad - oh, and don't tell your mother the last part.... keep it between us.  

...something I've always wanted to try.....

'Vanilla' van...('P.of S.' variety...low/no $...)....
Mod the sides....'looks like' sheet metal....'vehicle wrap' over perf. panels....
*Hmmm* ...as many 12~18" woofers that can be 'shoehorned' behind them....(...inside, of course...next to....*mmmmm*....).....
15~30 Kw Class Ds' ought to do it....for a start....
Set up drivers' seat as to be as isolated as poss. .....
(.....BIG earplugs anyway....)
Hero cams both sides, next to the mics.....
INVERT the 'input waveforms'.....
Suddenly....

Would it work? *L*shrug*

Dunno....be 'interesting' to go for a Drive, though....